Just to follow up on the dash display problem, everything points to a bad display board. There is proper voltage and ground to the display, I removed and checked key switch operation but still nothing. The customer has decided to send the truck to auction so I guess I'll never be 100 % sure but with the document Kevin_T sent and some pointers from a yale service tech, that's the only conclusion I can come up with. I had more time on this truck than can be charged but it was definitely a learning experience.

Thanks for the help,
Dino54