I just installed a new deck in my Tahoe. It's working great, but for some reason I'm only getting sound out of 4 of the 6 speakers. The speakers in the back doors don't work, only the 4x10's in the very back work, and the speakers in the front doors.

I spoke with a car install guy, and they told me that I have to basically choose 4 speakers that I want, and wire them accordingly. well, I want the 4 speakers in the doors to be working, but when I checked the harness to find which ports control the door speakers, I couldn't figure it out. I used some wires strapped to a battery to test the ports, I could hear a popping noise coming out of the very back speakers (the 4x10's) but I can't get sound to come out of the speakers in the middle door.

What can I do from here? I plugged the factory radio in briefly to make sure those speakers work, and sure enough they do, but as soon as I plug my new deck back in, I only hear the 4 speakers previously mentioned.

Does anyone know how I can get my deck to power the front 4 speakers?? Any help would be GREATLY appreciated.

Thanks!