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Old 03-25-2019, 10:36 AM   #1
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House battery only charges when plugged in

2011 Southwind 36D. The house batteries will only charge when plugged in. The engine will not charge the house batteries when running.

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Old 03-25-2019, 10:58 AM   #2
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Look in the engine compartment for a battery isolator. Also follow the line feom the isolator toward the house battery looking for a fuse or breaker. Likely a 30 or possibly a 50A fuse. Also likely the fuse has blown

Don and Lorri
2007 Dodge 3500 dually
Resident Dummy.
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Old 03-25-2019, 11:16 AM   #3
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Don most likely has given you the correct answer to your problem.

I had an unusual auxiliary start switch that had three positions. I once had to use the switch and afterwards my alternator would no longer charge my house batteries. Once I clicked the aux switch back down (six o'clock position) it started charging again. Weird and very rare situation...but worth a check.
Dave and Holly
2011 Winnebago Sightseer 33c with a 2011 Honda CRV behind.
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Old 03-25-2019, 12:09 PM   #4
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If you have a 3 position AUX Battery switch then check that.

Otherwise there should be a isolation solenoid that is a common failure item.

Find it by cycling the AUX or Boost switch while listening for it.

Check volts, by probing each side to ground, with the boost switch off and then on.

Off will measure chassis volts on one side and house volts on the other.
On will measure the same on both sides, because its connecting them together.

If it don't measure the same its bad. Replace it.
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Old 03-25-2019, 05:50 PM   #5
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Close to your battery banks is a Battery Control Center, made by RV Custom Products. Inside the black box is your isolator relay. Either the relay is not functioning properly or the circuit board is bad.
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Old 03-26-2019, 04:52 AM   #6
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Thanks for everybody help. I found the isolator relay bad in the battery control center bad.
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Old 04-05-2019, 06:45 AM   #7
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DS321, curious to know if you were able to change out the isolator relay and if it fixed your problem as I may be having the same problem?
Ken in Nebraska
98 Fleetwood Pace Arrow, 35U
97 Ford F53 chassis
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Old 04-05-2019, 08:07 AM   #8
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Yes it fix the problem. I found the exact relay on line. It is located in the battery control center. It is a little bit of a pain to do because it is behind the printed circuit board. You can get to the terminals to test but, that is about it without removing the printed circuit board.

2011 Southwind 36D/Ford
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