Newmar A/C Electrical Systems solenoid could have caused harm to the Bidirectional Isolator Relay...
Transcript of Newmar A/C Electrical Systems solenoid could have caused harm to the Bidirectional Isolator Relay...
POSSIBLE CHARGING ISSUES
1. BOTH BATTERY BANKS NOT CHARGING WHEN ON SHORE POWER OR
WHEN DRIVING(ALTERNATOR)
2. BOTH BATTERY BANKS NOT DICONNECTING WITH NO CHARGE AND
CANNOT START COACH, EVEN WITH BATTERY BOOST
Newmar has been having some issues with the solenoids we use for the charging system. On late
model Class A Newmar coaches, some of the solenoids have been found to have corrosion at the
contact points. The pictures show a cross section of a solenoid we had the issue with. We cut a
cross section of one of the bad solenoids (see pictures). If you look, you can see the green
corrosion on the contacts. It will cause an intermittent operation with the solenoid. To test,
remove either the house or chassis battery cables. Hook up a light to the open post and put
power to the coil of the solenoid. You must use something with an actual draw to properly test
contacts, a meter may show continuity but the solenoid might still be bad. It is possible that the
bad solenoid could have caused harm to the Bidirectional Isolator Relay Delay (B.I.R.D.). You
can open up the cover of the B.I.R.D. and visually look to see if it shows signs of burnt spots on
the circuit board.
PART NUMBERS
SOLENOID WITH POSSIBLE ISSUES #44482
NEW SOLENIOD #122684
SATELLITE PREP AND SOLAR PREP LOCATIONS
Satellite prep on most coaches will be in front of the front roof AC. If the coach has 3 AC’s, it
will most likely be located in between the front and center AC.
The solar prep for the coaches is “usually” set across from the stool room vent if possible.
Sometimes they put the wires behind the vent in the stool room if there is no room. Wires are
looped to the front overhead behind the electrical panel for a controller to be added for the solar
prep, if the customer would like. Those wires end at the batteries.
BLOCK HEATER
King Aire, Essex, Mountain Aire and Dutch Star all have a switch in the front overhead for the
block heater. All lower models are NOT equipped with this switch. The block heater on these
coaches is only wired into the breaker panel and can only be turned on/off at the breaker panel.
The breaker powers a receptacle that you can use to plug in your block heater.