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Old 12-13-2015, 07:00 PM   #1
Junior Member
Kirby's Avatar
Brand: Thor Motor Coach
Model: ACE 29.3
State: Florida
Posts: 21
THOR #3374
Alternator charging flaw

2015 ACE 29.3
Setup: trombetto contactor and BIRD.
While dry camping the house batteries ran down. Knowing the genset would not start with dead house batteries, I started the engine to charge the house batteries so I could start the genset. Still could not start the genset. I drove to next stop (300miles), still had dead house batteries.
Here is what I found:
Engine batt voltage was 14.4 (engine running). House batt voltage was 4 volts. The trombetto contactor will not close unless it has 8 volts on the house batt. Hence, the alternator will never charge the house batteries if they are less than 8 volts because the contactor will not close.
I made a short jumper cable out of 8GA wire and heavy duty batt clips to connect between the lugs on the trombetto contactor so I could start the genset if this scenario arises again.

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