I had the same problem with my 2003 Brave. It was stored on a lot without power. I don't remember having a switch to shut off the chassis battery, but I did shut off the coach battery.
My solution was the same as Ottawa. I removed both batteries and took them home. I could keep them charged with a charger.
Remember to check the water in the batteries to keep from boiling them dry.
W8RLM - Bob
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2006 Winnebago Journey, Model 39K, 2013 Dodge Dart
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