Audio Systems: 97 tahoe 4dr factory stereo wiring, rear doors, back doors

Question
i recently bought a 97 tahoe and the previous owner has wrecked the stereo. im ok with installing new stuff but it looks like there has been a few attempts at it already. there are components in the front doors, 6.5's in the back doors, and 6x10 above the rear doors. can you tell me how they were wired up originally.

Answer
The rear (cargo) speakers were on their own amp. The rest were normal GM color codes.
http://www.installdr.com/Harnesses/GM-Wiring.pdf
I would add an aftermarket amp if the factory one is missing.
The factory ones were loacted either under the driver's seat or behind the driver's side of the cargo trim panel. You may just want to not bother with the cargo area speakers and focus on a nice subwoofer...