I had a problem similar to the problem Lil Tucker described. The coach was a new Winnebago Vectra with a 330HP Cat engine and Allison transmission. The coach would not start sometimes. Turn the key several times and it was as though the the batteries were disconnected. Finally, it would start and run fine. I took the coach to Frieghtliner and they worked under the dash for 2 hours looking at the ignition switch, relays, ect. and found nothing. They presented me with a bill for 2 hours of labor. When I protested stating that the coach was new and this should be a warrenty item, they removed one hour, but I still had to pay for one hour. They said it was because they could not find a problem. I left Frieghtliner and stopped at the Flying J to fuel up. Guess what, the engine would not start after fueling. I called Frieghtliner and they sent a mechanic right out. It took him 10 minutes to diagnose the problem and fix it. It was a loose cable connection on the starter. He tightened the connection and that solved the problem. Oh by the way Frieghtliner refunded the money for that hour of labor they charged me after I requested it since they did find a problem.