i installed a sony cd player in my gtp today and it works, BUT not the front 4 speakers, just the back 2.  I exchanged both wiring harneses thinking they were faulty and it did the same thing.  Has anyone else experienced this problem or have any advice on the situation.  :?

Do the front 4 speakers have a factory amp?  If so, replacing the deck without taking that into consideration will yield those results.  I know when I replaced my deck in the TGP, Crutchfield sent me a relay that I had to wire in to get the door speakers to work.

I have a Sony CD player and the front two speakers on the dash work but the two door speakers don't.  Before I had an Aiwa CD player and all of them worked.  I don't know if its a Sony thing or that I just need to check my connections