Don,
Good try!
You know the problem is going to be something really silly and simple.
My fire truck has two batteries and if #1 fails the truck will not start with the key, there is a push-button switch on the dash that you use to allow battery # 2 to start the truck. I found this out the hard way, I never realized that battery #1 ALWAYS started the truck via the key no matter what battery was selected to be in-service.
Hope it's an easy fix!
Mike B
