It seems when I'm in an RV Park & connected to a power pedestal all of my outlets are working fine.BUT When I try to use my Firman wO831 inverter/generator there are four outlets that won't work. They are the two outlets in the ceiling for the TV's and the two outlets on the walls beside the bed. When I tried to check my generator I couldn't get the correct volts out of the 30 AMP plug. I tested the power cord of the trailer with a meter for continuity and there aren't any problems with that. Where do I go from here? The generator seems to work ok as far as the 15/20 amp outlet. but not the 30 AMP outlet?