Hi all, it's been a while since I've posted here. But I really need your help. I'm installing a Pioneer xm2go in the tray at the front of my tracs consel. Ive drilled a 1/4" hole under the rubber guard and I'm ready to splice into the power of my stock radio with a 14-18 gauge quick connector but I need to know what color the positive and negitive of my radios head unit are. I see about 20 wires in 2 harnesses but don't have a clue which ones feed the radio. I want the xm to come on and go off with the ignition so I thought splicing the radios power would be the most direct route. Thanks again in advance, Michael.