One other thought - your comment about your body affecting the reception is indicative of an antenna problem also. If you haven't already, check the ground (if you can see it and get to it) or shield connections to the antenna coax, not just on the radio end.
Amateur Radio WA4GIY
2009 Laredo 29RL 5er
2013 Ram 3500 crew cab long bed, 6.7 CTD, Aisin trans.
2001 25' Nomad Scout TT
2001 Ford F250, 7.3L TD
Curt E5 with a slider
Tekonsha P3 controller
Well if anybody is still following this thread I have for the most part solved my problem. Seems the PD4655 was creating a lot of RFI.As a last resort and just for the heck of it I installed a In-line noise filter at the radio.Problem solved.Still have questions as to the hows and whys but hey at least I've got tunes again.Thanks for all the replies,suggestions and help!
* This post was
edited 04/04/12 02:49pm by yankee camper *
Look for symptoms of radio frequency interference (RFI) elsewhere, too. In radios it exhibits itself as a buzz (even if not connected to the same 12v source), in television receivers it would be a buzz in the sound and/or white "sparkles" in the picture if it gets bad enough. It is possible to filter the output of your converter if it is severe.