I doubt it is engineered to work that way - they would have had to run wires to both battery busses with diode isolators to prevent cross-connecting the busses.
Do any other DC house loads have the same behavior? Like the overhead lights? If so it may be a failed isolator solenoid that is the cause.
Can you download your coach diagrams from Winnebago like we can for Thor to determine where it is supposed to get power from; and what could possibly be causing the cross-connect?
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Ted & Melinda
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