So ive posted like 3 questions nobody has answered on radios but whatever its worth a shot. I'm replacing my 99 mach 460 headunit with the 03 style 6 disc changer. I've got everything swapped out and it fits in like a dream and the only thing holding me back is the speakers. I got two adapters so the unit powers on, retains memory, etc. The only thing that dont work are the speakers. I got the amps to power on also, but no sound. There is an square black connector that plugs right into the headunit that i assume are the pre-outs for the amp, but no sound still. anyone care to shed some light on the mysterious black connector with the thick gray cable?