Something to look for I found was that the connectors going INTO the control box (the one with the clear Plexiglas front) became loose. Mine is a deep reach down from the front, so I would get a picnic table or some such and put it right in front of the coach. Then I could climb up on it and reach waaay down and push each of the connectors in a bit. I think there are four of them. Bet ya one is out just enough to deprive the box of power. Oh yea, one of them has thicker wires than the rest. I think that's the power supply. Good luck
There are a bunch of fuses inside the control box.
2004 Itasca Sunrise W22 chassis GM 8.1 Allison 1000 Towing a 2007 Chevy Cobalt four wheels down.