So my idea is this....it is not your AC Transfer Switch. That handles AC voltage, as implied by the name. Also by your description of the scenario, it seems the battery charge function is picking up the DC load when connected to shore or genny.
I'd say you have a connection issue to your house batteries. I'd start at the usual suspect, the battery terminal for loose/corroded terminals, including the chassis ground connection on the frame. Wiggle firmly, clean and reset if necessary.
Has there been any recent work that could have involved the batteries?
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2005 Providence 39L, Spartan, CAT 350
2021 Jeep GC 80th
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