ALTERNATOR, REGULATOR, BATTERY & STARTER TESTER

INSTRUCTIONMANUAL

ALTERNATOR, REGULATOR,BATTERY & STARTER TESTER

P/N 533347

IMPORTANT NOTICE

SAFETYAll Danger, Warning and Caution messages must be followed for your safety. These safetymessages will be preceded by icons displayed in the following formats:

This icon means you may risk possible loss of life.

This icon means you may risk bodily harm.

This icon means you risk damage to the vehicle or the tool.

These safety messages cover situations Bosch is aware of. Boschcannot know, evaluate and advise you as to all of the possible hazards. You must becertain that your personal safety is not jeopardized by any conditions or service proce-dures encountered. In addition to the safety messages:

This icon precedes notes that are added to provide clarity and helpful tips.

COPYRIGHTNo part of this manual may be reproduced, stored in a retrieval system or transmitted, inany form or by any means, electronic, mechanical, photocopying, recording, or otherwise,without the prior written permission of Bosch Automotive Service Solutions, LLC.

DISCLAIMERAll information, illustrations, and specifications contained in this technical instructionmanual are based on the latest information available at the time of publication. The right isreserved to make changes at any time without obligation to notify any person or organiza-tion of such revisions or changes. Further, Bosch shall not be liable for errorscontained herein or for incidental or consequential damages (including lost profits) inconnection with the furnishing, performance or use of this material.

9/2005 K.Z.

Copyright © 2013 Bosch Automotive Service Solutions, LLC.

iAlternator, Regulator, Battery & Starter Tester

Table of Contents

Read Me First ........................................................................... iii

Test FlowchartsBattery Test ...................................................................................... 1Starting Test ..................................................................................... 2Charging System Test ...................................................................... 3Battery Test After Charge ................................................................. 4

IntroductionAvailable Tests ................................................................................. 5Displays ............................................................................................ 5Keypad ............................................................................................. 6Test Leads ........................................................................................ 7Battery Tachometer .......................................................................... 8Recharging ....................................................................................... 8To Begin Testing ............................................................................... 9To Abort Testing ............................................................................... 9

Automatic TestsBattery Test .................................................................................... 11Starting Test ................................................................................... 13Charging System Test .................................................................... 15Battery Test After Charge ............................................................... 18

Other FunctionsMulti-Meter and Load On/Off Key ................................................... 19Review Results/Print Results .......................................................... 20Zero Amps ...................................................................................... 21Calibration ...................................................................................... 22Messages ........................................................................................24

MaintenanceDaily Maintenance .......................................................................... 25Diagnostic Procedure ..................................................................... 26Checks ........................................................................................... 28Replacement Items ......................................................................... 30Optional Items..................................................................................30Warranty and Service Information .....................................................33

ii

Safety

Warning• Stand back from the battery during testing.

Automotive batteries contain sulfuric acid and canproduce explosive gases that may result inserious injury. To prevent ignition of gases, keeplighted tobacco, sparks, flames, and other ignitionsources away from the battery at all times.

• Do not attempt to test a frozen battery, it mayexplode. Allow the battery to warm up to 60° Fbefore attempting any testing.

• Do not spray any liquids on the battery tester.Liquids may enter the tester and cause permanentdamage to the electrical components. Flammableliquids may cause an explosion.

• Wear an American National Standards Institute (ANSI)approved eye shield when testing batteries. Provideventilation and have water available for flushing incase any battery acid should splash on you.

• Do not touch the vent located at the rear of thetester. Excess heat given off during the batterytesting procedure can make this surface very hot.

• Do not remove any leads while the battery test isrunning. If a lead must be removed during a test,turn the battery tester off by pressing the OFFbutton or any tester key to end the test.

Caution• To prevent ruining the vehicle computer when

disconnecting battery cables:1. Turn the ignition, all accessories and loads

OFF. Close the vehicle doors and trunk lid.2. Remove the negative (–) battery cable first;

then remove the positive (+) cable.

• This tester is designed to test 6- and 12-voltautomotive batteries rated at 100 CCA or higher.Do not test small 6- or 12-volt batteries.

• The battery charger supplied with this tester isthe only battery charger to be used to charge thetester internal battery. Use of any other chargerwill void the warranty, may damage the tester andmay cause a fire.

• Do not charge the battery for more than 24 hours.Overcharging will damage the battery and thecharger.

• The tester is supplied with either a battery chargerdesigned for use with 110-volt, 60Hz power or acharger designed for 230-volt, 50Hz power. Usethe charger only with the voltage for which it israted. Failure to do so will damage the chargerand void the warranty.

• Do not leave the tester for prolonged periods indirect sunlight. This causes the display to dim dueto excess heat.

iiiAlternator, Regulator, Battery & Starter Tester

Read Me First

Before starting work with your battery tester,there are a couple of tasks you must doimmediately. First of all, unpack your batterytester but keep the shipping carton andpacking material. Should warranty or anyother repair become necessary, it is importantthat the unit be packed securely in its original,or an equivalent, shipping carton and packingmaterial.

The second task you must do is charge thebattery tester’s internal battery: you mayuse the charger as a source of supplementalpower for the battery tester during testing, ifnecessary. Plug the supplied battery chargerinto an electrical outlet (110-volt or 230-volt,depending on the rating of the charger). Plugthe charger cable connector into the chargerreceptacle. Refer to figure 1. The battery willbe fully charged in 12 - 24 hours.

Do not charge the battery for morethan 24 hours.

The battery tester will display an alert mes-sage when the internal battery power is lowand it is necessary to recharge the internalbattery.

Figure 1

Battery Charger

ChargerReceptacle

WARNING:Do not touchduring batterytest. Surface getshot.

iv

Notes

1

Flow Charts

Alternator, Regulator, Battery & Starter Tester

Test FlowchartsFor a comprehensive electrical system test, run the following tests in order:1. Battery Test2. Starting Test3. Charging Test

The following flowcharts help guide you through the tests. Refer to sections in this manual for moredetailed instructions.

BEFORE TESTING:1. Make sure the vehicle battery cables and terminals are clean. Wire brush them if necessary.2. Inspect the following and repair any problems before testing: Belts, belt tension, battery cables,

connections, battery hold down, battery condition, battery fluid level.

1. Connect the negative (–) heavy load lead to the battery.2. Connect the positive (+) heavy load lead to the battery.

Press BATTERY TEST

1. Enter the battery CCA as prompted.2. Enter the temperature if prompted. • The load test will run automatically. • Stand away from the battery.

Good Battery

Good, Low Charge

Bad Battery

Charge & Retest

Battery Mustbe Replaced

1. Charge battery per manufacturer's specification.2. Perform Battery Test After Charge

Is Open-Circuit Voltageless than 7.5 volts?

Tester will ask if thisis a 6-volt battery

Press 1 if Yes, 2 if No

Yes

No

Battery Test

2

Flow Charts

Connect the Heavy Load Leads to the battery (if not already connected).

Hold the amps probe clear of any conductor and press [ZERO AMPS]. Then connectthe probe to the negative battery cable, with the arrow pointing toward the battery.

Press [STARTING TEST]

Disable ignition (gas engines) or fuelsystem (for diesel engines) so theengine will not start during the test.

Crank the engine until the message "Test Complete"is displayed. Press [CONTINUE] to see the results.

DisplayCranking Volts

Good starter Check starterspecification

Select "Quick Test" or "Standard Test"

Enter the number of cylinders

"Is it a Diesel" answer Yes or NoStandard Test

Start engine as prompted

Quick Test

"Test Complete" Press[CONTINUE] to see results

Good starter Check starterspecification

Do standard test?Yes

View results

No

DisplayCranking Amps

DisplayCranking Volts

DisplayCranking Amps

Starting Test

3

Flow Charts



1. Hold amps probe clear of any conductor,press ZERO AMPS.

2. Connect the probe-arrow pointing to thebattery-to the vehicle's negative battery cable.

Regulator Volts

Good

Bad

N/A

Regulator voltage must be withinvehicle specifications. Normalrange is 13.4 - 15.3 volts.Specifications may vary betweenvehicles.

Repair or replaceAlternator

1. Raise and hold engine speed at 2000 RPMuntil display shows Run at Idle.

2. Return to idle and maintain until displayshows Test Complete.

3. Shut engine off.4. Press CONTINUE to see results.

Charging SystemTest

1. Start engine2. Press CHARGING SYSTEM TEST.3. Enter number of cylinders

Peak Amps

Diode Condition

Diode pattern could not bediagnosed. Run test again. Iftest is still incomplete, useMultimeter to perform furtherpinpoint testing (full-field test).

4

Flow Charts


Press BATTERY TEST AFTER CHARGE

Battery TestAfter Charge

1. Enter the battery CCA as prompted.2. Enter the temperature if prompted. • The load test will run automatically. • Stand away from the battery.

Charge the battery as specified by the manufacturer.

Good Battery

Bad Battery Replace Battery

Is Open-Circuit Voltageless than 7.5 volts?

Tester will ask if thisis a 6-volt battery

Yes

No

Place BatteryBack in Service

Battery Test and Battery TestAfter Charge are valid for 6-and 12-volt batteries. StartingTest and Charging System Testare valid ONLY for 12-voltbatteries.

5

Introduction


IntroductionAvailable Tests

Battery Test - Automatic test to determinewhether an automotive battery is good, bad, orrequires charging.

Starting Test - Tests the condition of the starterto show cranking volts, cranking amps andwhether the starter is good or bad.

Charging System Test - Checks the chargingsystem at high RPM and at idle to show regulatorvolts and peak amps. Indicates whether alternatordiodes are good or bad.

Battery Test after Charging - This test can onlybe used on a battery that has already beentested once and has triggered the Charge andRetest message. The battery must be fullycharged according to the battery manufacturer’sspecifications before this test is performed. Theprocedure for testing after charging is the sameas the Battery Test, except that the computertakes charging into consideration when itdiagnoses the battery.

Multi-Meter - This function shows RPM, volt-meter readings, battery voltage and DC amps.

Displays

There are three liquid crystal displays on the faceof the tester (see Figure 2):

Main Display - (Top) - shows messages,information, and results for automatic tests aswell as multimeter information.

Volts Display - (Lower left) - shows batteryvoltage, as read through the battery load leads.The range is to +/- 40.00 DC Volts.

Amps Display - (Lower Right) - shows current(amps), as read through the amps probe. Therange is 0 to +/- 1000 Amps.

Amps readings are either negative or positive. Anegative reading has a minus sign (-); a positivereading has no sign.

When the amps probe is hooked up to a vehicle(clamped around the vehicle’s negative batterycable with the arrow pointing towards thebattery), a negative reading indicates a batterydrain; a positive reading indicates the battery isbeing charged.

Main Display

Volts Display Amps Display

Figure 2

6

Introduction

Keypad

The tester emits a beep when a key is pressedand a command is accepted. The tester indicatesan entry error has been made by emitting alonger, lower tone.

1. POWER keys - Used to turn the tester onand off. If the tester is not used for 15minutes, it will automatically turn itself off,but test data will still be saved. See ReviewResults for details.

2. CONTINUE key - Used during automatictesting to move from one screen or step tothe next. The main display reads<<CONT>> when this key is active.

3. NUMERIC keys; CLEAR and ENTER keys- Used to enter information, such as numberof cylinders, into the computer duringtesting.

4. TEST SELECTION keys - Used to selectautomatic tests.

5. FUNCTION keys - Used to select functionsother than automatic tests.

6. LOAD ON/OFF key - Used for manualbattery load testing, this key applies andreleases a battery load. The load isautomatically released after 15 seconds ifunused.

Figure 3

1

5

4

2

3

6

7

Introduction


Test Leads

Heavy Load LeadsThe heavy load leads are used to read systemvoltage and to put a load on the battery duringload tests. The computer’s battery tach featureuses heavy load leads to read engine RPM.

Connections:1. Make sure battery cables and terminals are

clean. Wire brush them if necessary.2. Clamp the black (negative) load lead to the

negative battery terminal.3. Clamp the red (positive) load lead to the

positive battery terminal.

Amps ProbeThe amps probe is a hall effect lead used to readthe current (amps) flowing through any conductorit is clamped around. During the starting andcharging tests, the probe reads systemamperage. The probe can also be used with themultimeter to read amps anywhere. The probeis not used for battery testing.

ConnectionsClamp the probe around the vehicle negativebattery cable, making sure the arrow on theprobe is pointing towards the battery. Also besure the probe is around all wires running to thenegative battery terminal connector.

The Zero Amps procedure sets the amps probeto zero.

Voltmeter LeadsThe voltmeter leads are used to read search voltsduring multimeter testing. Use the positive andnegative voltmeter leads to read the voltage dropbetween any two points in a circuit.

Notes on Test ResultsThe results of the automatic tests are shown onthe main display at the end of each test.

Results are also held in memory, even after thetester is turned off. To review the latest results,press the [Review Results] key. If the tester hasbeen off since the latest test, press [ReviewResults] immediately after turning the tester on.If any other test key is pressed after turning thetester back on, the old test results are lost. Seethe Review Results section in this manual forcomplete details.

Figure 4

HeavyLoadLeads

AmpProbe

Voltmeter Leads(Search Volts)

8

Introduction

Battery Tachometer

This tester is equipped with a battery tachometerthat enables the tester to read engine RPMthrough the battery without having to connect aseparate tachometer lead.

Battery Tachometer Limitations• The Battery Tach range is 0 to 3000 RPM.

• When a load is applied to the battery, orwhen certain battery conditions change, theRPM readings may be temporarilyinterrupted. When this occurs, erratic RPMvalues may be displayed, or the display mayread “N/A” in place of the RPM. Thereadings normally recover after a fewseconds, when the battery conditionstabilizes. Wait for readings to appear andstabilize before continuing.

• In unusual cases, the battery tachometer willnot be able to get any RPM readings at all.This may happen under one of two conditions:

1. The electrical systems on certainvehicles may operate outside therange of the battery tachometer.

2. Certain alternator conditions mayprevent the battery tachometer fromgetting a reading.

In either case, “N/A” will appear permanently onthe display in place of the engine RPM. When thisoccurs, wait 15 seconds to make sure the “N/A”reading is permanent. If it is, the tachometerreadings are not available for the vehicle beingtested.

The Charging Test is the only automatictest affected by an N/A reading. Analternate procedure is available thatallows completion of a charging test whenRPM is not available. See the ChargingSystem Test section of this manual.

Recharging

• The tester is equipped with its own internalbattery and charger.

• The battery must be charged overnight atleast once a week. The manufacturerrecommends storing the tester on thecharger every night.

• To save battery power, the tester auto-matically shuts off if not used for 15 minutes.

• To optimize battery life, do not leave thetester on charge for more than 24 hours ata time.

To Charge the BatteryUse the charger provided with your tester. Thereare other chargers that may look the same, butthey will damage the tester.

1. Plug the charger into the tester socket.

2. Plug the charger power cord into a standardwall outlet.

9

Introduction


Figure 5

To Begin Testing

When the tester is first turned on, the maindisplay shows search volts (a voltmeter), engineRPM, and the number of cylinders (see Figure5). This is the multimeter function. Completeinstructions for the multimeter are in the Multi-Meter section of this manual.

To Abort Testing

Press one of the test selection keys. The testerwill move to the beginning of the test selected.

SEARCH - 0.003 V.

0 RPM 4 CYLS

10

Introduction

Notes

11

Automatic Tests


Figure 6

C. The display reads "BATT: REGULAR 0)CHANGE TYPE” (see Figure 7). Press[Continue] to accept the battery type.

Press [0] to change the battery type. Thebattery type listed on the display willchange to AGM/OPTIMA. Press [0] again tochange the battery type back to REGULAR.

Figure 7

Automatic TestsBattery Test

The battery test uses a number of variables,including temperature, recovery voltage andother electrical factors to diagnose a battery. Ittells you whether the battery is good, bad orrequires charge and retest.

HookupMake sure the vehicle battery cables andterminals are clean. Wire brush them ifnecessary.

1. Clamp the black load lead to the vehiclenegative battery terminal.

2. Clamp the red load lead to the vehiclepositive battery terminal.

Test ProcedureA. Press [BATTERY TEST].

If, after pressing [BATTERY TEST], thedisplay reads CONNECT CLAMPS, repeatthe hookup procedure; make sure the loadleads are connected securely.

B. The display reads “INPUT CCA: 0)CHANGE UNITS.”

Press [0] to change the battery rating units.The unit reading on the display will changeto CA. Press [0] again to page throughMCA, DIN, IEC, EN, and A-HR. The unitsetting will be retained after tester power isturned OFF.

Enter the battery rating, using the numerickeypad (see Figure 6). Then press [ENTER]to begin the Battery Load Test. The batteryrating is usually printed on the battery.

INPUT CCA0) CHANGE UNITS

BATT: REGULAR0) CHANGE TYPE

12

Automatic Tests

D. The display now reads TEST INPROGRESS (see Figure 8).

Figure 8

The tester may wait a few seconds to restthe battery. When the test begins, a 50-second countdown is displayed. During this50 seconds, the tester applies a load to thebattery, releases it to let the battery recover,then applies it again. When the load isapplied, listen for the sound of the solenoidclosing.

To stop during the test, press any func-tion key, or press [POWER OFF].

Do not touch the vent located at therear of the tester. Excess heat givenoff during the battery testing proce-dure can make this surface very hot.

Test Results

The Main Display reads “TEST RESULT:” andshows the diagnosis (see Figure 9):

TEST IN PROGRESSTEST TIME = 50

Figure 9

TEST RESULT:GOOD BATTERY

IS 6 VOLT BATT? - This message will bedisplayed if the battery open-circuit voltageis less than 7.5 volts. Press [1] if YES, [2] ifNO.

GOOD BATTERY - The battery is capable ofholding a charge and performing to specs.

GOOD, LOW CHARGE - The battery is good, butit should be recharged.

BAD BATTERY - The battery will not hold acharge and perform to specs. It should bereplaced.

CHARGE & RETEST - The battery conditioncannot be determined until after it is fullycharged.

The battery must first be completelycharged per the battery manu-facturer’s recommendations beforerunning the Battery Test After Charge.

Press [Continue] to accept the battery type

13

Automatic Tests


Starting Test

In the starting test, the operator has the option ofperforming a Quick Starting Test or the StandardStarting Test. The Quick Starting Test allows theoperator to perform a quick check of the startingsystem without disabling the engine. The Stan-dard Starting Test requires disabling the enginefor a more thorough test.

Hookup

Make sure the vehicle battery cables and termi-nals are clean. Wire brush if necessary.

1. Clamp the black load lead to the vehiclenegative battery terminal.

2. Clamp the red load lead to the vehiclepositive battery terminal. Make sure bothload leads are connected securely.

3. Remove the amps probe from any conduc-tor and press the [Zero Amps] key (See“Zero Amps” section for complete details.).

Then clamp the amps probe around the vehicle’snegative battery cable, so the arrow on the probepoints toward the battery. Be sure the probe isaround all wires running to the vehicle’s negativebattery terminal connector.

Test Procedure

A. Press [STARTING TEST]. The display willask you if you want to run a Quick Test orStandard Test. Press [1] to run the QuickTest or [2] to run the standard test.

B. The display will read “INPUT # CYLS” (seeFigure 10). Type in the vehicle’s number ofcylinders on the numeric keypad and press[ENTER] (The computer accepts numbersfrom 2 to 12.).

C. The display asks “Is it a diesel?” Press [1] ifYES; [2] if NO.

Figure 10

INPUT # CYLS =

<<ENTER>>

Quick Test

D. If you selected the Quick Test, you will beprompted to start the engine. Once you havestarted the engine, the test will run automati-cally, and then display “TEST COMPLETE.”

1. Press [CONTINUE]. The display showscranking volts. Press [CONTINUE] again.The display shows cranking amps.

2. Press [CONTINUE] again. If the displayreads “GOOD STARTER,” the test is com-plete. If the display reads “CHECKSTARTER SPEC,” press [ENTER]. Youwill be asked if you wish to run the stan-dard test. If you select [YES], proceed tostep E, “Standard Test”. If you select[NO], the tester will cycle through theresults again. The results are displayed ina loop, so press [CONTINUE] again toreturn to cranking volts. Press [CON-TINUE] again to see cranking amps; andso on.

To exit the loop, select another test.

14

Automatic Tests

Results

To see the test results, press [CONTINUE]. Thedisplay shows cranking volts. Press [CON-TINUE] again to see cranking amps. Press [CON-TINUE] again to see starter diagnosis: either“GOOD STARTER” (see Figure 14) or “CHECKSTARTER SPEC”.

Figure 14Figures 11, 12 and 13

Standard Test

E. The display will read “DISABLE IGNITIONAND CRANK ENGINE” (if not a diesel) (seeFigure 11), or “DISABLE FUEL SYSTEMAND CRANK ENGINE” (if a diesel). Dis-able the ignition or fuel system so the enginewill not start when cranked. When the ve-hicle is disabled, crank the engine.

F. The display now reads “MAINTAIN CRANK-ING” (see Figure 12). Keep cranking theengine for a few seconds, until the displayreads “TEST COMPLETE.”

G. When the test is complete, the display reads“TEST COMPLETE” or “TEST INCOM-PLETE” (see Figure 13). Stop cranking theengine.

The results are displayed in a loop, so press[CONTINUE] again to return to cranking volts.Press [CONTINUE] again to see cranking amps;and so on.

To exit the loop, select another test.

DIESEL STARTERS – Some large diesel en-gines with good starters may draw crankingcurrent in excess of the tester’s diagnosticlimits. Always check the manufacturer’sspecifications before condemning dieselstarters.

“TEST INCOMPLETE” – The display will show“TEST INCOMPLETE” instead of results ifthe vehicle’s battery was too low to continuecranking, or if, for any other reason, crank-ing was discontinued during the test. Cor-rect the problem and run the test again.

GOOD STARTER<<CONT>>

DISABLE IGNITIONAND CRANK ENGINE

MAINTAIN

CRANKING

TEST COMPLETE

<<CONT>>

15

Automatic Tests


Charging System Test

The Charging System Test is valid for12-volt systems only.

In the charging system test the tester takes read-ings both at high RPM and at idle. Results showregulator volts and peak amps, and whether thealternator diodes are good or bad.

Hookup

Make sure the vehicle’s battery cables and term-inals are clean. Wire brush them if necessary.

1. Clamp the black load lead to the vehicle’snegative battery terminal.

2. Clamp the red load lead to the vehicle’spositive battery terminal. Make sure bothload leads are connected securely.

3. Remove the amps probe from anyconductor and press Zero Amps key. Seethe Zero Amps section for complete details.

4. Then clamp the amps probe around thevehicle’s negative battery cable, so that thearrow on the probe points toward thebattery. Be sure the probe is clampedaround all wires running to the vehiclenegative battery terminal connector.

Prevent the Engine from Starting:

Prepare the vehicle so it will not start when theengine is cranked. Use one of the methods listedbelow, depending on the type of vehicle beingtested, or refer to manufacturer’s information.

1. Disconnect the battery power to the posi-tive coil terminal. This prevents the coil fromactivating the secondary ignition.

2. On vehicles with a conventional distributorcap, remove the coil lead from the top of thedistributor cap and ground it.

Failure to properly ground the wire mayresult in damage to the system.

3. On some computer-controlled vehiclesequipped with fuel-injection, hold the throttlewide open while cranking the engine. Thefuel injection system automatically disablesitself because it assumes that the engine isflooded. If the engine starts at first, shut itOFF and crank again, keeping the throttlewide open.

4. On vehicles with Throttle Body Injection(TBI) or Central Fuel Injection (CFI), dis-connect the fuel injector. This will disablefuel flow.

OR5. Remove the power to the fuel pump to

disable fuel flow on any vehicle with Elec-tronic Fuel Injection (EFI) or diesel engine.

16

Automatic Tests

Test Procedure1. Start the engine.

2. Press [CHARGING SYSTEM TEST]. Thedisplay must show the correct number ofcylinders in order for the RPM reading to becorrect. The bottom line of the displayshows the number of cylinders, which isautomatically set to four (4) unless you havechanged it during a previous test.

To change the number of cylinders, pressthat number on the numeric keypad. Pressany number from 2 - 12.

3. The top line of the display reads “RUN AT2000 RPM” (see Figure 15). Set the enginespeed to at least 2000 RPM. When the com-puter detects RPM around 2000, thedisplay flashes “MAINTAIN 2000 RPM.”

4. After 10 seconds, the display reads “RUNAT IDLE” (see Figure 17). Reduce theengine speed to idle. When the computerdetects idle speed, the display reads“MAINTAIN IDLE.”

Figure 17

RUN AT IDLE1500 RPM 8 CYLS

Figure 15

Figure 16

MAINTAIN2100 RPM 8 CYLS

RUN AT 2000 RPM

2100 RPM 8 CYLS

If the RPM reading says “N/A,” see RPM NotAvailable, later in this section.

Hold the RPM at 2000. After an adjustmentperiod, a counter appears in the corner ofthe display and counts down from 10 sec-onds (see Figure 16).

Maintain the engine at idle speed. Forengines larger than 4 cylinder, idle meansless than 1000 RPM (see Figure 18). For 4-cylinder or smaller engines, the idle is 1200RPM or less. The tester will check the diodecondition.

17

Automatic Tests


If the engine speed is not low enough, set itas low as possible and press [CONTINUE].

5. After the idle test, the display may read“RUN 800-1000 RPM” (see Figure 19). Thismessage appears if the RPM was not highenough, or if conditions were not right dur-ing the diode reading. For the computer toproperly read the diode condition, the RPMmust be between 800 and 1000. Raise theRPM to between 800 and 1000 and hold it.

Figure 20

The display then reads “MAINTAIN IDLE.”Hold the idle between 800 and 1000 RPMwhile the diode pattern is read again. Thisprocess may last a few seconds. When thetest is complete, the display reads “TESTCOMPLETE.”

6. The test is now complete. The display reads“TEST COMPLETE” or “TEST INCOM-PLETE.” Shut the engine off.

Press [CONTINUE] to see the results.

RPM Not AvailableIf the battery tach cannot read the RPM duringthe charging test, the RPM value reads “N/A”(Not Available). In this case, when the chargingtest reads “RUN ENGINE AT 2000 RPM,” thelower right of the display flashes “<<CONT>>”(see Figure 20). It is still possible to run the testas follows:

RUN AT 2000 RPMN/A RPM<<CONT>>

Figure 19

Figure 18

MAINTAIN IDLE1500 RPM 8 CYLS

RUN 800-1000 RPM1200 RPM 8 CYLS

If the RPM is “N/A,” press [CON-TINUE]. Absence of RPM does notaffect test accuracy.

1. Run the engine as close to 2000 RPM aspossible. Use the vehicle dashboard tach-ometer, or estimate engine speed. When theengine speed is approximately 2000 RPM,press [CONTINUE].

18

Automatic Tests

2. Hold the engine speed at approximately2000 RPM until the display reads “RUN ATIDLE” (see Figure 21). Then set the engineat idle and press [CONTINUE]. Theremainder of the charging test runs normally.

2. In any other case, the N/A result requiresfurther pinpoint testing. Use the multimeterto perform such tests as a full-field test,fusible link test, etc. The exact proceduresdepend on the vehicle being tested. Referto the shop manuals or to themanufacturer’s information.

Results are displayed in a loop. Press[CONTINUE] to see regulator volts. Press[CONTINUE] again for peak amps, and so on.

Battery Test After Charge

Run this test ONLY after both of the followingconditions have been met:

• The message “CHARGE AND RETEST”appeared after the regular battery test wasrun on the same battery currently beingtested;

• The battery has been completely chargedfollowing the battery manufacturer’s charg-ing recommendations.

Hookup and Test ProcedureThe initial test procedure is the same as for theother Battery Test:

1. Connect test leads.

2. Enter battery rating (CCA, CA, etc.).

3. Perform test.

ResultsThis test takes into account that the battery hasjust been charged. It will not diagnose any batteryas CHARGE AND RETEST. It calls the batterygood or bad.

Figure 21

RUN AT IDLEN/A RPM <<CONT>>

ResultsThe first result displayed is regulator volts. Thisis the maximum voltage read during the chargingsystem test.1. If the amps stayed higher than 20 during the

charging test, a star (*) appears near theregulator volts on the display. The regulatorvolts are probably lower than normal be-cause the charging current was so high.

2. Press [CONTINUE] to see the peak amps.This is the maximum alternator outputdetected during the test.

3. Press [CONTINUE] again to see the diodecondition; the display says the diode patternis either good or bad.

The display message may read “N/A” (NotAvailable). When this occurs:

1. If RPM was high during the idle part of thetest [CONTINUE] was pressed, run thecharging test again. Make sure the idle isadjusted correctly before running the test.

19

Other Functions


Other FunctionsMulti-Meter and Load On/Off Key

Whenever the tester is turned on, the defaultsetting is Multi-Meter. The multimeter functioncan also be accessed by pressing [MULTI-METER] from any other test.

The multimeter function displays all meterreadings at the same time. The main displayshows RPM and Search Volts (voltmeter read-ing). Current (amps) and load lead volts are alsoshown on their respective displays.

Use the multimeter function along with the LOADON/OFF key for manual testing.

Multi-MeterThe top line of the main display reads “SEARCH- X.XX V.” (see Figure 22). This is the Search Voltsreading. The voltage being read through thesearch volts leads is ± 40.00V DC.

When using the search volts leads, make sureto use both leads. If only one lead is used, thesearch volts reading will be inaccurate.

The bottom line of the display shows RPM andthe number of cylinders, which is automaticallyset to 4 unless you have changed it during aprevious test. Or, if 0 is selected for the numberof cylinders, RPM will be N/A (Not Available).

The display must show the correct number ofcylinders in order for the RPM reading to becorrect.

To change the number of cylinders, press thatnumber on the numeric keypad. The tester willaccept any number from 2 - 12.

If the RPM is not displayed at all, make sure thebattery load leads are securely connected andthe correct number of cylinders is displayed.

Load On/Off KeyUse the LOAD ON/OFF key to put a load on thebattery for testing purposes, as follows:

Figure 22

SEARCH - 0.03 V.0 RPM 4 CYLS

20

Other Functions

1. Press [LOAD ON/OFF] once to put the loadon. The bottom line of the display reads“LOAD ON” (see Figure 23).

2. The load will remain on for 15 secondsunless you press [LOAD ON/OFF] to re-lease it. After 15 seconds, the load is auto-matically released.

Figure 24

SEARCH - 0.03 V.1800 RPM WAIT 5

Figure 23

Review Results/Print Results

Press [REVIEW RESULTS] to display the latestresults from all tests that were performed.Results are displayed in a CONTINUE loop; keeppressing [CONTINUE] to page through them, asdescribed on the next page.

If you have purchased the optionalprinter, and it is connected properly tothe tester and turned on, when you press[REVIEW RESULTS], the display willread:

1) VIEW RESULTS2) PRINT RESULTS (This will give the

user a printout of all test results inthe order the tests were performed.)

If the optional printer is present and theVIEW RESULTS/PRINT RESULTSmenu does not appear, make sure theprinter is plugged in to an electrical out-let, is connected properly to the tester'sprinter port (see Figure 25) and is turnedon. Press [REVIEW RESULTS] again todisplay the VIEW/PRINT menu.

SEARCH - 0.03 V.1800 RPM LOAD ON

3. After the load is released, there is an auto-matic cool down period lasting as long asthe load period. The display reads “WAIT”and counts down to zero (see Figure 24). Atzero, the multimeter display returns.

Figure 25

Centronics-CompatibleParallel Printer Port

21

Other Functions


Results from the most recent tests will be storedeven after the power is shut off. To retrieve resultsafter the power is shut off, turn the power backon and press [REVIEW RESULTS].

When a test is selected after turning the powerback on, all old results are cleared from memoryto prepare for the new testing session.

If a certain value has not been obtained sincethe power was last turned on and a test selected,that value will be skipped in the loop. This is theloop:

1. Press [REVIEW RESULTS] to see Batterydiagnosis.

2. Press [CONTINUE] to see Cranking Volts.

3. Press [CONTINUE] to see Cranking Amps.

4. Press [CONTINUE] to see Star terdiagnosis.

5. Press [CONTINUE] to see Regulator Volts.

6. Press [CONTINUE] to see Peak Amps.

7. Press [CONTINUE] to see Diode Patternresults.

To get out of the loop, select another test or themultimeter function, or turn the power off.

Provided the tester has not been turnedoff, you may disconnect the printer fromthe tester, move the tester to anotherlocation to perform a test, then bring thetester back and reconnect the printer inorder to print out test results.

Zero Amps

Zero Amps sets the amps probe reading to zero.For optimum performance, run this procedurebefore every Starting and Charging test, andbefore using the Amp reading on the Multimeter.

When the amps probe is “zeroed,” the computersets the probe reading to zero. This is slightlydifferent from the complete calibration procedure.During the calibration procedure, the computersets the reading at zero at an amperage readingthat is determined by the computer. The cali-bration procedure is more thorough, but takeslonger to complete.

The Zero Amps procedure is very fast and maybe performed frequently to serve as a quickassurance of accuracy. Calibration, on the otherhand, does not have to be performed very often.See the Calibration section of this manual formore information.

Procedure1. Remove the amps probe from around any

wire and hold it away from any conductorspresent. Allow it to close completely. Do notplace your fingers or anything else throughthe hole.

2. Press [ZERO AMPS]: If the display reads“REMOVE AMP PROBE,” make sure theprobe is not around a conductor. Then press[CONTINUE].)

The display reads “PROBE CALIBRATED.” Theprobe is zeroed.

The tester automatically switches to themultimeter function in approximately three (3)seconds, unless another test or function isselected.

22

Other Functions

Calibration

If the tester senses it is out of calibration, themessage “CALIBRATION IS NEEDED” willappear.

The procedure will calibrate all the tester’s leads -the load leads, amps probe, and search voltsleads.

A good, fully-charged 12-volt automobile batteryis needed to complete the procedure.

ProcedureTo calibrate the tester, follow the steps below. Ifany messages appear on the display that do notappear in these instructions, follow the directionson the display. For further explanation of any dis-played messages, refer to the MESSAGESsection of this manual.

1. Press [CALIBRATION]. The display reads:1 ENGLISH2 SPANISHPress [1] for English, or [2] for Spanish.

2. The display reads: "SET DATE xx/xx/xx" (seeFigure 26). If the displayed date is correct,press [CONTINUE] and go to Step 4.

If the date is not entered or is not correct, usethe numeric keypad to enter the correct datethen press [ENTER}.

Figure26

3. The display reads "SET TIME 24HRxx:xx:xx" (see Figure 27). Use the numerickeypad to enter the correct time, then press[ENTER].

As noted on-screen, the unit has a 24hour clock (also known as "military time").

Figure 27

4. The display reads “INPUT TEMP UNITS.”Press:

[1] for Fahrenheit,[2] for Celsius.

This sets the units for manual temperatureinput during battery test.

Manual temperature input is not alwaysnecessary.

Temperature settings will be retained afterthe tester is shut off.

5. The display reads “SHORT SRCH VOLTLEADS” (see Figure 28). To short the searchvolts leads, clip them together so that themetal clips are in complete contact witheach other. Then press [CONTINUE].

SET DATE09/02/05

SET TIME 24 HR10:14:23

23

Other Functions


Figure 28

6. The display reads “SEE CALIBRATIONDIAGRAM” (see Figure 29). Connect all thetest leads as shown in the diagram (seeFigure 30) to a good, fully-charged 12-voltautomobile battery:

A. Connect the positive (+) load lead tothe positive battery terminal.

B. Connect the negative (-) load lead tothe negative terminal of the battery.

C.Connect the search volt leads to thevehicle battery posts. Connect thepositive to positive, negative to nega-tive. If a connection cannot be made tothe battery posts, clip them to the brasspart of the load clamp jaws.

Figure 29

Figure 30

D. Connect the amp probe around thenegative load lead cable. When theleads are connected as shown inFigure 30, press [CONTINUE].

7. Under normal conditions, the display nowreads “CALIBRATION IN PROGRESS.”

During calibration, the tester puts a load onthe battery. Calibration takes only a fewseconds.

8. When calibration is complete, the displayreads “UNIT CALIBRATED.” If no otherselection is made, the display automaticallyswitches to the multimeter function after 15seconds.

SHORT SRCH VOLTLEADS <<CONT>>

SEE CALIBRATIONDIAGRAM <<CONT>>

– SearchVolts Lead

+ SearchVolts Lead

+ HeavyLoad Lead

– HeavyLoad Lead

24

Other Functions

Messages

The following are main display messages thatmay appear on occasion. These messages arenot covered in the standard operating procedure.

Testing MessagesAMP PROBE FAULTY - The amps probe is faulty.

See Diagnostic Procedure in theMaintenance section of this manual.

BATTERY VOLTAGE TOO LOW - The automo-bile battery voltage is too low for testing.

CALIBRATION IS NEEDED - The test leads mustbe calibrated. Run the calibration pro-cedure.

CHECK HEAVY LOAD CLAMPS - The heavyload lead connection is erratic when theload is placed on the battery. Checkconnections.

CONNECT BATTERY CLAMPS - The batteryclamps are reading no voltage.

SWITCH BATTERY CLAMPS - The batteryclamps are attached to the wrong polaritybattery posts. Switch them.

Calibration MessagesBATTERY VOLTAGE TOO LOW - The automobile

battery voltage is too low to calibrate.Connect the leads to a good, fully chargedbattery and repeat the procedure.

CHARGE BATTERY & REPEAT - The car batterydoes not have enough charge to be usedfor the calibration procedure. Connect leadsto another, fully charged battery and press[CONTINUE]. If another battery is un-available, remove the leads and completelycharge the original battery. Then repeat theprocedure.

CHECK HEAVY LOAD LEADS - Readings areunstable when the load is placed on thebattery. Check the heavy load lead connec-tions.

CHECK SEARCH VOLT LEADS - Make sure thesearch volts leads are properly connected.Press [CONTINUE]. The leads may becorrect but the battery is too low.

CONNECT BATTERY CLAMPS - The batteryclamps are reading no voltage.

CONNECT AMP PROBE - Connect the ampsprobe around the negative load lead cable.

CONNECT SEARCH VOLTS - The tester is notreading sufficient voltage through thesearch volts leads when it tries to calibrate.Make sure the search volts leads areproperly connected, then press[CONTINUE].

SEARCH VOLTS NOT SENSED - The searchvolts are not sensed by the computer. SeeDiagnostic Procedure in the Maintenancesection of this manual.

SEARCH VOLTS OUT OF CAL - The searchvolts are beyond specs required for auto-matic calibration. See Diagnostic Procedurein the Maintenance section of this manual.

SWITCH SRCH VOLT LEADS - The search voltsleads are attached to the battery post of thewrong polarity. Switch them.

25

Maintenance


MaintenanceDaily Maintenance

• Clean the outside surface of the tester,keypad and display. Wipe clean with a mild,multipurpose cleaner.

• Clean and inspect the test leads, as follows:

1. Clean the cables with a mild,multipurpose cleaner.

Do not use solvents or harsh clean-ers on the cables; they will eventuallydry out and crack the cables.

While cleaning the cables, inspect fordamage and replace as necessary.

2. Keep the clamp ends clean. Use a smallwire brush if necessary. Or, if the clampends are corroded, use emery cloth toclean the brass.

Do not use carburetor cleaner or harshchemical solvents on the clamps.Carburetor cleaner may damage sen-sors.

3. Clean the clamp casings with a milddetergent or cleaner.

26

Maintenance

Diagnostic Procedure

Introduction

The test leads, charger and the tester’s internalbattery are user-replaceable.

The diagnostic procedure listed below helpsdetermine whether any of these user-serviceableparts are the cause of a problem.

This section makes frequent reference to theChecks procedures in the next section.

When a user-serviceable part needs to be re-placed or the tester itself needs service, call theTechnical Service number listed on the insideback cover of this manual.

The First Thing to Do ...When a tester fails, first try shutting the poweroff and turning it back on. Any time the tester fails,the failure may be temporary, due to a numberof possible temporary conditions. Shut the poweroff and on a number of times, making sure topress [POWER ON] firmly for at least one (1)second every time the tester is turned on.

• IF the tester recovers, there is no problem.

• IF the problem still exists, check throughthe entire diagnostic procedure.

• IF a step does not apply, go to the next stepat the same level.

1. IF the tester does not power up correctly...• IF, when the tester is turned on, the top

line of the LCD contains 16 boxes andthe bottom line is clear, the tester hasfailed and cannot be repaired. Call theTechnical Service number listed onthe inside back cover of this manual.

• IF nothing appears on the display whentester is turned on, make sure theproper procedure is being followed.Press [POWER ON] firmly and hold itfor at least one (1) second.

• IF nothing appears on the LCD displaywhen correctly turned on, try pressingsome of the keys. If a faint beep isheard when pressing a key, the batteryin the tester could be discharged. Trycharging the tester overnight with theincluded battery charger.

• IF charging the tester does not help,the charger may be faulty. Check thecharger with a voltmeter, following theprocedure in the Checks section.

The battery charger supplied with thistester is the only battery charger to beused to charge the tester internal bat-tery. Use of any other charger willvoid the warranty, may damage thetester and may cause a fire.

• IF the charger is good but the testerstill did not hold a charge, the testermay have a bad internal battery. Checkthe battery according to the procedurein the Checks section.

27

Maintenance


2. If the tester does power up correctly...

• IF, when the tester is powered up, itdoes not beep or respond at all whenany key is pressed, the tester needsservice. Call the Technical Servicenumber listed on the inside back coverof this manual.

• IF when the tester is turned on, itcontinually beeps and the clamps arenot connected to anything, the testerneeds service. Call the TechnicalService number listed on the insideback cover of this manual.

• IF the volts display (battery voltage)reads 0.00 volts or reads a highlyunlikely voltage when the leads aresecurely connected to a good batterywith a 12-volt charge, the tester mayneed service. Try connecting the leadsto several different batteries, each timemaking sure that leads are securelyconnected to the correct batteryterminals.

• IF the voltage reading is still incorrect,check the test leads with an ohmmeter,according to the procedure in theChecks section.

• IF the test leads are OK, the testerneeds service.

Connect both the search volts and theload leads to the battery and comparethe readings. Both should read approx-imately the same.

• IF the search volts reads 0.00 voltswhen connected to a 12-volt batteryand the load leads read correctly, checkthe search volts leads with anohmmeter (see Checks section).

• IF the tester consistently displays themessage “CHECK CLAMPS” duringthe battery test even after pressing[CONTINUE], the tester may needservice. Try testing several differentbatteries, each time making sure thatleads are securely connected to thecorrect battery terminals.

• IF the problem still occurs, check thetest leads with an ohmmeter. Refer toChecks section.

• IF test leads are OK, the tester needsservice. Call the Technical Servicenumber listed on the inside back coverof this manual.

28

Maintenance

Checks

These checks are used in conjunction with thepreceding Diagnostic Procedure section. If thereis a problem with the tester and its cause is un-certain, first run through the Diagnostic Proce-dure section for the appropriate checks.

Charger CheckFirst make sure the charger is plugged into aworking outlet. To check the charger with avoltmeter:

1. Plug the charger into a working outlet.

2. Read the voltage at the jack. Put thepositive (+) voltmeter lead to the outsideportion of the jack. Put the negative (-)voltmeter to the inside. Make sure thepolarity is correct.

3. There should be between 4.5 and 10 voltsDC. If the reading is less than 4.5 volts, thecharger is not functioning correctly. Call theTechnical Service number listed on theinside back cover of this manual.

The battery charger supplied with thistester is the only battery charger to beused to charge the tester internal bat-tery. Use of any other charger willvoid the warranty, may damage thetester and may cause a fire.

Internal Battery CheckTo access the battery, remove the three phillipshead screws from the battery holder cover plate.Disconnect the wires from the battery and,observing proper polarity, check the tester’sinternal battery with a voltmeter, as follows:

1. First make sure the charger is good. Referto Charger Check.

2. Using a good charger, put the tester’sinternal battery on an overnight charge.

3. Connect the voltmeter’s positive lead to thepositive (+) terminal of the battery. Putnegative voltmeter lead to the negative (-)terminal of the battery. The battery shouldbe around 6 volts when charged. If, afterbeing fully charged by a good charger, thebattery is below 6 volts, replace the battery.

Test Lead Checks Amps Probe - If the probe is bad, an “AMP

PROBE FAULTY” message will appear.Replace it.

Search Volts Leads - Disconnect the search voltsleads from the tester and check them withan ohmmeter. Put one ohmmeter lead to thepositive (red) search volts clip; put the otherend to the positive pin. Try both pins todetermine which is positive. The resistanceshould be less than 0.2 Ohms. If not,replace the search volts leads. Repeat thesame procedure for the negative lead.

Finally, connect the ohmmeter leads to bothpins. There should be no continuity betweenthe pins. If there is, replace the lead.

29

Maintenance


Negative (-) LeadThe negative lead has two circuits: battery loadand volts.

1. Battery Load Circuit - Put one ohmmeterlead on the exposed end of the cable,where it is bolted to the bottom of the tester.Put the other ohmmeter lead on the clamp’slower jaw (the jaw with the black boot on thehandle). Ohms should read 0.0. If the meterreads more than 0.2 ohms, the lead shouldbe replaced.

2. Volts Circuit - Attached to the bottom of thetester is a cable. A small wire coming outof the end of the negative cable plugs intoa socket on the bottom of the tester.Remove this wire from its connector socketand connect one of the ohmmeter leads toit.

Connect the other ohmmeter lead to theupper jaw on the battery clamp. Ohmsshould read 0.0. When there is more than0.1 ohms, the entire positive lead should bereplaced.

Checking the Load Leadswith an OhmmeterThe ends of the load leads run under a plasticcover on the bottom of the tester. To access theload lead cable ends, remove the screws holdingthe cover in place. Check the leads as follows:

Positive (+) Lead:The positive (+) lead has two separate circuits:battery load and volts.

To check the two circuits of the lead, use anohmmeter as follows:

1. Battery Load Circuit - Put one ohmmeterlead to the exposed end of the cable whereit is bolted to the bottom of the tester. Putthe other voltmeter to the clamp’s lower jaw(the jaw with the red boot on the handle).Ohms should read 0.0. If the meter readsmore than 0.2 ohms, make sure the clampis clean, and recheck. If the resistance is stillhigh, the lead should be replaced.

2. Volts Circuit - Where the cable is attachedto the bottom of the tester are white, blackand red wires from the cable that plug intoconnector sockets. Remove the black wirefrom its connector socket and connect oneof the ohmmeter leads to it.

Connect the other ohmmeter lead to theupper jaw on the battery clamp. Ohmsshould read 0.0. If the meter reads morethan 0.1 ohms, the entire positive leadshould be replaced.

30

Maintenance

Replacement Items

Battery HolderCover Plate

P/N 510-04615

Battery ChargerP/N 535-04680

(110V 60Hz)

P/N 535-06269(230V 50Hz)

Internal BatteryP/N 535-05924

Optional Items

Roll-Around StandModel #B42-252 (unassembled)Model #B42-253 (assembled)

31

Maintenance


Notes

32

Maintenance

Notes

33

Maintenance


Bosch Automotive Service Solutions, LLC Limited Warranty

THIS WARRANTY IS EXPRESSLY LIMITED TO ORIGINAL RETAIL BUYERS OF BOSCH ELECTRONICDIAGNOSTIC TOOLS (“UNITS”).

Bosch Units are warranted against defects in materials and workmanship for three years (36 months) from date ofdelivery. This warranty does not cover any Unit that has been abused, altered, used for a purpose other than that forwhich it was intended, or used in a manner inconsistent with instructions regarding use. The sole and exclusiveremedy for any Unit found to be defective is repair or replacement, at the option of Bosch. In no event shall Bosch beliable for any direct, indirect, special, incidental or consequential damages (including lost profit) whether based onwarranty, contract, tort or any other legal theory. The existence of a defect shall be determined by Bosch in accordancewith procedures established by Bosch. No one is authorized to make any statement or representation altering the termsof this warranty.

DISCLAIMERTHE ABOVE WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING ANYWARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

SOFTWAREUnit software is proprietary, confidential information protected under copyright law. Users have no right in or title toUnit software other than a limited right of use revocable by Bosch. Unit software may not be transferred or disclosedwithout the written consent of Bosch. Unit software may not be copied except in ordinary backup procedures.

ORDER INFORMATIONReplacement and optional parts can be ordered directly from your Bosch authorized tool supplier. Your order shouldinclude the following information:

· Quantity· Part number· Item description

Technical ServiceIf you have any questions on the operation of the product, please call (800) 533-6127.

Repair ServiceWhen sending your Bosch electronic product in for repair, please include the following information:

· company name· contact name· telephone number· description of the problem· proof-of-purchase for warranty repairs· preferred method of payment for non-warranty repairs

Payment can be made with Visa, Master Card or with approved credit terms. To receive a credit application,please fax your request to the Credit Department at 800-962-8734.

Send the unit to:Bosch Automotive Service Solutions, LLC, Owatonna FacilityPO Box 9942300 Park Drive, Owatonna, MN 55060-0994Attn: Repair

9/15/00

34

Maintenance

Alternator, Regulator, Battery & Starter TesterInstruction Manual

2013 Bosch Automotive Service Solutions, LLC. All rights reserved09/13/05 Part Number 53334709/13/05 Part Number 53334709/13/05 Part Number 53334709/13/05 Part Number 53334709/13/05 Part Number 533347

ALTERNATOR, REGULATOR, BATTERY & STARTER TESTER

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Transcript of ALTERNATOR, REGULATOR, BATTERY & STARTER TESTER