Well I got it figured out. I got a few minutes to run out to the truck and I disconnected the external antenna and plugged in the factory antenna that comes from the roof and guess what, my Nav is working again. So both Sirrius and GPS appear to use the same antenna.

Now I know how it works but this is not going to help me getting my Sirius and Nav working with the camper on the truck. I don''t know if I'm going to find a way to make it work, I may have to be without one or the other while the camper is on the truck.

So do you folks have any suggestions what I can do to make this silly thing work.