2002 and Up Ford Focus Mach 500 Audio

I recently had installed an aftermarket radio on this 02 Focus with factory mach 500 audio system. Thought I'd share my findings: The standard wiring harness kit for after market radios works. (I mean it can be purchased at any audio store FWH-594). However, the Mach 500 audio system (similar to the shaker500 found on mustangs) is equipped with a 12" subwoofer and two amps pwering the woofer. This is the third harness found on the back of the factory headunit. I managed to make it work by using the RCA Sub out of the aftermarket stereo in mono. Here is the the wires used. WHITE/ RED stripe     Factory amp turn on. WHITE/ BLACK stripe   (+) Low Input. Grey/ Black stripe    (-) Low Input. I couldn't find any info on this system so I'd thought I'd post my findings here.