This may sound crazy but in our 2008 Expedition the dash radio stopped working and after checking fuses, removing it from the dash, and then checking wiring to front speakers nothing made a difference. I went into the bedroom to check the rear speakers and turned on the overhead 12v lighting and suddenly the radio started working. I have no idea why. After that when the radio stopped working, I went to the bedroom, turned on the lights and the radio came on! Talk about gremlins in the rv. Who knows how Fleetwood wired the 12v system so that this would happen.