2002 gmc envoy car audio wiring

i have a 02 envoy, i installed my 6 1/2 polk audio components speakers (sub in door) (tweet top of seatbelt), i used the wires that were already in the door, im taking out the factory radio and i dont use wiring harnest, i know the speaker color wires, but i need to know what is my ground and power colors? thanks http://tinypic.com/f3b6fo.gif

if u want to know, im putting a thousand watt zapco to two 12" premiere audio's 750rms, polk audio 6 1/2 component sets in front and back doors, ran with infinity reference 7541a, i have 4 JL tr evolution 4x6 that i will build an inclosure on top of my subs in the back or custom somthing else being ran by a sony xplod 800w, i will post pics when im all finished with this, thanks againhttp://tinypic.com/f3b6fo.gif