One thing to check is the power connections to the generator. I had a problem with our generator this past summer and had to replace the temp sending unit on our Onan 7500 watt QD. When I was taking covers off to work on it I found the wires that supply power to the coach were loose and all I did was touch them and they fell out. Surprised that they made contact at all but I tightened them up, installed the sensor and all was good after that.
It's easy enough to check and simple enough to tighten the connections up.
2009 Monaco Camelot 425 Hp 42DSQ