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Old 08-07-2016, 02:49 PM   #1
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Coach and House battery

My house batteries do not charge while running the motor home only shore power or gen
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Old 08-07-2016, 08:34 PM   #2
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What model and year coach? Different models have different methods of charging the house batteries from the altenator.

Most of them use a solenoid (Big Boy, Trombretta, etc.) to bridge the house and chassis batteries when the chassis batteries reach a predetermined charge status. A common problem is contact failure in the solenoid.

Your coach info will help the forum give you further info.
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Old 08-07-2016, 08:36 PM   #3
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What model & year is your motorhome.

Some motorhomes do not charge the house batteries while running the engine.
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Old 08-07-2016, 09:55 PM   #4
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Your profile shows a 2006 Diplomat.

Yes it should be charging the house batteries from the engine charging system.

As xydial said, it has a Big Boy or Trombretta solenoid, that bridges the chassis batteries to the house bank, once the chassis sees a 13.4 charging voltage.

The solenoid is a common failure point. Once you ID the solenoid, it is easy to troubleshoot. If it has 13+ volts to one of the small treminals, while the engine is running, you should see the same (13.4 ) voltage on both large cable terminals. If it has different volts on each terminal, it's not connecting internally.

Some kind of house battery charging system is common on all MHs. Those who don't, have something wrong.
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Old 08-07-2016, 10:04 PM   #5
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Quote:
Originally Posted by twinboat View Post
Your profile shows a 2006 Diplomat.

Yes it should be charging the house batteries from the engine charging system.

As xydial said, it has a Big Boy or Trombretta solenoid, that bridges the chassis batteries to the house bank, once the chassis sees a 13.4 charging voltage.

The solenoid is a common failure point. Once you ID the solenoid, it is easy to troubleshoot. If it has 13+ volts to one of the small treminals, while the engine is running, you should see the same (13.4 ) voltage on both large cable terminals. If it has different volts on each terminal, it's not connecting internally.

Some kind of house battery charging system is common on all MHs. Those who don't, have something wrong.
Actually, I have a 2000 Holiday Rambler. It does not have the BIRD relay necessary to charge house batteries. Not all motorhomes have that ability.
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Old 08-07-2016, 11:12 PM   #6
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Actually, I have a 2000 Holiday Rambler. It does not have the BIRD relay necessary to charge house batteries. Not all motorhomes have that ability.
In your MH, I would be looking for a battery isolator.
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Old 09-02-2016, 10:23 AM   #7
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Guess the OP got lost. Hope he finds his way back. This is such a common issue and easy to fix.
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