Ok so my buddy has a 96, 1500 with the Stock infinity system in it, Now he recently got a new head unit and we are having trouble rewiring it. Does anyone have the wiring diagram for the 1996 6 speaker sound system????

 

see if this helps.
and be aware the infinity system has those amps out on the door speakers, and if you don't get power to them, then you get no sound.

http://www.installdr.com/Harnesses/DCP-Wiring.pdf