STARTING & CHARGING SYSTEM DIAGNOSIS Battery Starter Alternator.
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Transcript of STARTING & CHARGING SYSTEM DIAGNOSIS Battery Starter Alternator.
STARTING & CHARGING SYSTEM DIAGNOSIS
Battery
Starter
Alternator
Test Equipment
VAT–40 & AVR Voltmeter Ammeter Carbon-pile variable
resistor
Safety Issues
Batteries can explode if sparks occur around them.
Battery acid is very corrosive. It can burn skin and cause blindness.
Remove negative battery cable if making any large repairs.
Battery Identification
Conventional Lead Acid (Cap Battery or Deep Cycle)
Maintenance Free AGM (Absorbed Glass Mat)
Battery Testing
Battery capacity or load test. Battery drain test. Hydrometer test. (Cap batteries only) Special Testing for AGM Batteries (Absorbed
Glass Mat)
Battery Load Test
Discharge battery ½ cold cranking amps.
+ -
Carbon pile
voltmeterammeter
>9.6v½ CCATurn resistorto get amperage(artificial load)
Battery
On the Car Connections
Battery Services
Clean battery case Clean battery terminals Check proper hold down Charging batteries Jump starting Replacing batteries
Cleaning Batteries
Battery Charging
Standard Slow Charger2 – 12 amp capacity.
Fleet Battery Chargerhigh amps can jump andfast charge.
Jumping or Boosting aDead Battery
Positive to Positive Negative to Ground
Starting System Testing
Starter load or draw test. Starter voltage drop. Cable voltage drop. Solenoid voltage drop.
Starter Draw Test
ammeter
voltmeter
Note: ammeter in series and voltmeter in parallel.
Measure whilecranking engine
On the car connections
Battery Cable Test (Voltage drop)
voltmeter
voltmeter
Note: Voltmeters to be set at low volt scale.
0.2v max.
0.5v max.
Measure whilecranking engine
Testing the Solenoid (voltage drop)
voltmeter
0.2v max.
Measure whilecranking engine.
Starter Bench Test
Installing a New Starter
Safety tip: Always remove negative battery terminal.
Alternator/Regulator Testing
Alternator output test. Voltage regulator setting. Full field test.
Alternator Output (amps)
- +
Alternator
To vehicle load
Carbon pile
amps
Battery
Adjust to max.alternator output(artificial load)
Amp ratingon alternator
Read outputhere.
Run engine at 1500 –2000 rpm.
On the Car Connections
Voltage Regulator Setting
- +
Alternator
To vehicle load
Carbon pile
Battery
Quickly load alternatorand back off.
Run engine at 1500 –2000 rpm.
Voltmeter
13.8 - 15.3v
Full Field an Alternator
When you have a dead charging system use this test todetermine if the alternator is at fault or the regulatoris at fault.The test basically puts full battery voltage to the fieldwinding in the rotor of the alternator. If the alternator is OK it will put out maximum output and the regulatoris the problem. If no output is still noticed the alternatoris faulty.
Full Fielding
This will build a largemagnetic field in thefield coil.
Diode Scope Pattern