... thats odd.. your stock system shouldnt need the pwr ant. to run... i wired my whole system had my pwr and grnd wired and found out that my REM wire didnt want to use my pwr ant. wire on my head unit i just double wired my p. cont (put two wires in one end of the butt connector and one in the other end)and bam, worked like a charm.. reguardless if your stock system doesnt use a pwr ant wire since you dont have one.