What year Trac do you have, and which radio is in it? I have an 01 with the 6 disc in dash. I was able to hook up an aux-pod adaptor. The harness plugs into the 20 pin connector which is occupied by the rear radio control plug. This particular brand allows you to piggyback onto the harness. This allows you to hook up the aux pod and still maintain your rear controls. When I want to listen to the Ipod, I simply press CD a second time and it switches the ipod input and plays thru the stereo, all while charging the ipod. Best ipod accessory I have ever purchased, and I've purchased a lot of accessories! Now, it is my understanding that this might not work on 03 and newer models because of something to do with satelite radio?