1999 chevy tahoe audio

I put a new deck in my 99 Tahoe. When testing it, I'm only getting sound out of 4 of the 6 speakers in my truck, the two in the front doors, and the two in the very back of the cab (not the two in the back passenger doors).  I know that it's a simple wiring problem, but I am having the hardest time finding a wiring schematic that shows the wiring colors for all 6 speakers! I want the 4 speakers in the doors to work, and not the 4x10's in the very back of the truck. I tested using a low volt battery the leads, to find which speakers go to which wires, I get a popping sound in the front two, and the two in the very back, but still cannot figure out what the wires are, running to the door speakers!

If anyone can be of assistance, I would *greatly* appreaciate it. I don't know what else to do. There's only 2 wires that aren't tapped into coming from the dash harness (which doesn't make sense, since two speakers aren't sounding and they each take two wires) so I really just don't know what to do from here.

Thanks again!

-Brian

brown + yellow -  LR  dark blue + light blue -  RR   what wires have you tagged?

I had the same problem in my '97, but at the time I had an eclipse dealer installing my deck and they fixed it for me. I can pull the radio if you like and see which wires are taped as long as the colors havent changed any.

what make and model wiring harness did you buy???

It's the Metra wiring harness, I got it off eBay.

METRA 70-1858 1987-2005 GM CD RECEIVER WIRE HARNESS

before you go pulling your head unit out, let me tell you I was able to find the problem, and fix it.

My 99 Tahoe apparently has a factory amp in it, to control the back four speakers (2 back door speakers, and the 2 4x10's in the rear).

If I'd known that, I would have been able to fix the problem the day I ran into it.

So for those out there with this type of problem, just know you need to tap a 12v hot wire to the factory amp. The factory amp comes into the console harness, and it's a pink color. So I tapped on the aftermarket harness the 'Power Antenna" line (blue in color, third from the top if you're looking at it from behind) the remote wire from the HU. Turned the car back on and VIOLA! It worked perfect and sounds AWESOME. I'll get some good JL components (or I may go JVC all around, since my HU is the Kameleon KD-AVX49 JVC).  Two 12 W7's and I'm going to be set.

Thank you both so much for your assistance. I do appreciate it.