I don't have a Nova, but I had something like that a few years back in Baker, California. We had pulled over and parked for the night because of high winds. Next day the coach would start and then it seemed like somebody would turn the switch off. I started to roll and again it seemed like the switch would turn the engine off. So I took the switch off the dash and noticed that the back end of the switch was spread out about 1/8 inch. I pushed it back to a tight fit and it just so happened that I had some thin wire and I tied it together real tight. It started right away and I have not even bothered to buy another switch. It has worked perfect with the problem never coming back.
