Radio Wires For A Pontiac Grand Prix?

Question

I need the designations for the wires so I can splice in an amp.

Answer 1

Speaker wires:
left front: (+) tan (-) gray
right front: (+) lt. green (-) dk. green
left rear: (+) brown (-) yellow
right rear: (+) dk. blue (-) lt. blue

Accessory power at radio for amp turn-on: yellow (only in 2003 and older; should be located next to orange constant power wire)

Answer 2

http://www.installdr.com/InstallDocs/GM.html