I believe that
this is the controller you are asking about. I have no experience with it but it looks like a good controller and I suggest you check carefully how it is wired into your truck. I had just about the same experience with my Prodigy when I first installed it. Finally took it to a dealer and they found I had it wired in wrong. It has worked fine since they corrected it for me. Perhaps you have mis-wired it just as I did.
Barney
Edit: Oops, I see John and I were posting at about the same time and supplied the same link.
