No 110 power from either shore power or generator

[jcchase]

I have no 110 power from either shore power or generator, do get 110 power when I turn the inverter on.

I've checked fuses, circuit breakers, GFCI's & am no closer to finding a solution than when I first started. The trailer is a Sunnybrook 391SUT. I have a Prowatt 3000 inverter with 2 12v batteries in addition to the standard 2 6v batteries that came with the unit. In order to maintain the batteries at full charge, I keep them connected to a battery maintainer.

Will dead batteries cause the 110 power to not work? Maybe one of the 4 batteries is dead.

Thanks for your help.