We had a similar issue with our 2016 ACE 29.3. Turns out the wiring to the transfer switch burned through. We had 115 if we ran the generator and we had 12 volts, but no shore power. Popped the hatch on the electrical components (which is under the bed) and noticed that the transfer switch box was melted. The wires inside were burned to a crisp.
RV is in the shop having this fixed. Nothing like an electrical fire under your bed to rattle your confidence.
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