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Stiles,
I believe the auto/off control system operates off the DC battery even when hooked to shore power. I think another question I'd be asking is why was the battery discharged when the shore power was plugged in? Possibly a defective battery or charge circuit?
It seems to me from looking at previous posts some of the Montanas come with a single battery, where ours was delivered with two SRM Interstate Marine/RV Deep Cycle units. They lasted 5 years and would have lasted longer if I hadn't let them freeze last winter.
We boondock most of time for 3-4 days and have never had a problem with low DC voltage. But then again we spend most of our time outdoors.
Good luck and let us now how things turn out.
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