What I was trying to say is that you use the color codes of the wires coming out of the head unit, which you attach to a harness plug.


(from my write up)

Since you will know from your head unit which wires go to which speakers (and probably have a separate sub-out), you can then look at the pins on the harness connector to determine which is which. For example, using my install as an example, I know that

- the gray lead is the Right-Front positive lead. (Socket B, pin 3)
- the gray/black lead is the Right-Front negative lead. (Socket B, pin 4)



(from my write up)

So knowing the Socket/Pin, we next refer to the socket in the car and find the number of the pin that Socket B, pin three connects and what color that wire is. Then we look it up (the pin numbers are on the radio block...) on the drawing below (which you provided as well)



Then you have to determine by looking at the wires, where they go on the amp, and you have to figure out which pins on the amp (choice of two for each channel left and right) is the rear connection. You can get or make a connector for the amp with all the wires and use it as a test harness to ID the channels. Or you can search the forum deeply to see if anyone has figured it out already (I think they have - https://www.crossfireforum.org/forum...hlight=amp+pin (output side of factory amp)
https://www.crossfireforum.org/forum...hlight=amp+pin (input side of factory amp and other good stuff, especially the second page where one post goes into some points about the rear subs)
).

My plan is to simply leave the factory subs in place and run separate sub leads to another amp and subs)

P.S. Disregard the big bold red circles - they're from a different question.