is there any reason why the wiring harness for the stock am/fm radio would be different than whats in the service manual? i hooked a new radio up and have no power. the service manual lists a color for the wire directly to the batt but i dont have that color wire. the rest are correct. im not an electrician, but i generally have no problems hooking up radios. i cant get power to the new radio. all fuses appear to be ok. thanks