sounds like your Automatic Transfer Switch - a box usually located under the bed, or near your Main Panel, where the large generator and shore power wires come in... the box's switch is 'energized' when on Shore POwer, but if that fails, it will default to the normal Generator side, and you'll never get 120v from Shore POwer, even though everything else works when on Generator.
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The Turners...
'07 Rockwood Signature Ultralight...
two Campers and two Electric cars : )
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