As I stated above, the problem is very intermittent. It has actually done this to me 2 times , both during the same inspection. any other time I have tried to check it, it runs fine for me. When it does it on someone else, they put it in neutral and call me. when I put it in gear, it works. It has to not work to bypass anything. I was hoping some one else might have encountered this same problem and figured it out. As it is, for me to check anything, it would have to not work. I would only know if I bypassed something and it still had the problem that it was not that. I truly appreciate any and all suggestions. As for the neutral light goes, it only comes on when the truck is in neutral.