Originally Posted by Rednroll

The radio could definitely be part of the problem. Aftermarket radio's like the Pioneer, tend to have higher EMC levels, than an OEM since the aftermarket units don't have to meet Chrysler's EMC test specifications....which ultimately make the costs of the radio rise significantly. Higher EMC levels means it is very possible that the radio could be interfering with the compass.

One thing you might want to try from my personal experience just today. I added a speaker awhile back in the center of my dash where the compass mounts, thus I had to relocate the compass. So I just moved it off to the side, closer to the glove box. Well, my compass stopped working....I didn't care, though....I have a Nav unit...and didn't need something to tell me which way N,S,E and W was. Today though, I decided to upgrade my stock battery to a Diehard Platinum Marine. After replacing the battery, I noticed my compass magically started working again, after have been reading "N" for the past 6 months. So something tells me that disconnecting the battery might reset the compass, and the other electronics it communicates with...so maybe you should give that a try. Just disconnecting the compass and reconnecting didn't work....it had to be the battery disconnected.