I'll guess by your wording that all the 12v accessories work when plugged into shore power. When not on shore power there is no power from the tested good batteries reaching the 12v accessories. Also sounds like you know how to use your VOM.Your Montana should be equipped with a battery disconnect switch usually located in the basement storage area. If that is good/on, then look for a 30amp resettable fuse located close to the batteries.
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2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
Retirement Training Completed
I think the little voices in my head have started a chat group.
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