When connecting to shore power, I recently experienced a 15-minute delay waiting for power to energize my motorhome circuits. When I first experienced this, I began checking breakers and testing for power at the pedestal. Everything checked OK, but a loud sound from the generator area (like slapping your hand down hard on a table) was reported by someone outside.
The delay has ocurred several times, but I have not heard the slapping sound again. When I turn the generator on everything operates normally. Is there a switch/relay that will accept 110V from either the generator or shore power but not both?