Quote Originally Posted by J57ltr View Post
1 More than likely a bad fan motor. Brushes worn causing intermittent connection to Comm.

2 bad ground to the radio causing a ground loop. Antenna connection, ground or interference with some other device installed into the dash likely.
Thanks for your reply. I know I had a lot of info in my first post, but I did already test the motor itself and it is fine. The real problem is a break in the wire that comes from the underhood fuse panel (fuse 30) to pin C of the resistor pack in the cabin down near the blower.

Everything works fine if I run a test jumper wire between those 2 points. Just looking for the best way to find the break in the wire and ultimately repair it. Maybe my only option is to run a new piece of wire (correct gauge) in parallel to the factory harness from the fuse panel to the resistor pack connector.