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Old 09-23-2019, 12:05 AM   #1
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6 Volt batteries not charging from engine

Reversed one battery when installing 2 new 6 Volt house batteries in my allegro open road gas 2011 .
Corrected but not being charged from engine.Shore and generator power charge OK.
Checked all fuses and seem to be OK. Is there a fuse in the line from 6 Volt house batteries to engine alternator? and where would it be located?
Planning on dry camping for a week in 2 days and wonder if running generator driving down the highway would be OK if I can't find the problem.
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Old 09-23-2019, 05:23 AM   #2
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Shore power and generator power house batteries. If you have a invertor, then engine will charge. I normally just run generator, when driving, especially in the summer to run house a/c . Dave
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Old 09-23-2019, 05:30 AM   #3
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Ensure inverter is operational. Ours will fail to come on sometimes when lo voltage on battery bank
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Old 09-23-2019, 06:02 AM   #4
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Inverter has nothing to do with engine alternator charging the house batteries.

There will be an isolation/charging solenoid that handles that. It is also used as the Boost/ Aux Start solenoid. You can find it by switching the boost/Aux switch on and off, while listening for it.

Once located, you can follow the large cables leaving it, to see if there are large ( over 150 amp ) breakers near the batteries.

You can also hold the boost switch, while the engine is running ( shore power off ), to see if the house batteries get a rise in voltage. That confirms its operating.

Typical circuit breaker.

Typical boost/isolation/charging solenoid.Click image for larger version

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Old 09-23-2019, 08:10 AM   #5
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Correct, it's likely the solenoid that has gone bad. It's not uncommon, and not real expensive to fix. Once you find it, start your engine and check the leads on both sides. If you get 13+ volts on the engine side and none on the other, then you have reason to believe a new one will be a good path to follow.
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