i just put in a new stereo in my truck and everythings all set and working but the wiring harness came with 2 seperate harnesses shown in the link i have here. can anyone tell me what the grey plug is for with the two aduio plugs on the end and 2 blue wires?
it is in case your vehicle comes with the factory woofer so you can plug that rca jack to the subwoofer out of the new radio, if you don't have the woofer don't worry lincoln expedition and mustang have the same harness and woofers
