Heres the deal. 04 QC 1500 w/infinity system. I installed my sony headunit, powers up fine, but no sound. I know I need tap into the stock amp remote turn on....but which wire would it be. There is a spot for Amp Turn On on the stock wiring harness, but there is no wire coming out of it. I am also pretty certain the wires are different color for 02-03 and 2004. Any help would be greatly appreciated.