The Onan 5500 Marquis Gold in my 2011 Itasca Sunova will not start. We just returned from a 10 week 7,500 mile trip, but didn't use the generator, although I ran it a couple of times on trip. The coach gas tank is full, the batteries are charged, I had engine running on coach and there was nothing when I tried to start on the panel or on the generator. No grinding, clicking? Would this be an electrical issue? I'll check circuit breakers or fuses when I go back over to storage. Any other thing I should already know about?