John,
First make sure you test the accessory plug with a volt meter to see that it has power and that you haven't blown a fuse. The center pin on the on the acc. plug should be positive. If it's not positive and the polarity is reversed the compressor will still work but the GPS will not. The GPS circuit may have diode protection and not pass current at reverse polarity.
There is also the possibility the GPS plug assembly is not making good contact for some reason.
So my first guess is possible reverse polarity. Center pin Positive...
Thanks for your help today Cliff, reverse polarity was the culprit. :spank: Fixed the wiring, checked it with my new volt meter and all is well and working. This forum rocks! :rockon:
