2003 Mercury Mountaineer "car woofer built amp wiring" Questions

woofer has its own built in amplifier and filter .. it then just needs power and inputs from each channel .. since you are running 500 watt speakers, they likely already have a subwoofer component ..

...car adapter harness. they installed a small amplifier to power the rear door speakers and unless you connect those two wires then the speakers will not work. I had the problem on my 94 Suburban. I ...