This is a fantastic link. Immediately below is a quote from it.
Originally Posted by fuddyduddy121
Here are the 94 amplifier wires (Facing the detached wiring harness):
12 11 10 9 8 7 6 5 4 3 2 1
24 23 22 21 20 19 18 17 16 15 14 13
1 - Green - Hot at all times 12V+
4 - Black - Ground
7 - Purple/White - From Gain Control, Variable
8 - Dk. Green - Radio On Input
9 - Dk. Blue - RH Rear Channel from Radio +
10 - Brown - LH Rear Channel from Radio +
11 - Lt. Green - RH Front Channel from Radio +
12 - Tan - LH Front Channel from Radio +
13 - Lt. Blue/Black - RH Rear Subwoofer Output +
14 - Dk. Green - RH Rear Subwoofer Output -
15 - Lt. Green/Black - LH Rear Subwoofer Output +
16 - Dk. Blue/White - LH Rear Subwoofer Output -
20 - Purple - To Gain Control
21 - Lt. Blue - RH Rear Channel from Radio -
22 - Yellow - LH Rear Channel from Radio -
23 - Dk. Green - RH Front Channel from Radio -
24 - Grey - LH Front Channel from Radio -
I haven't taken a good enough look at the rear speaker wires, but I'm a little confused about something here. Is there a crossover? I know the stock speakers are dual voice coils and have tweeters right next to them. Is there a crossover? I see "Subwoofer Output," but I haven't been able to get to the amp wiring to see what'* up. It'* all encased in that awesome GM electrical tape. The OE amp is in my garage right now, but that probably won't help except that I could hook it up to 12V and see how it works.
Are the rear 6x9 speakers kept separate from the tweeters? How do the dual voice coils connect to the amp? I am going to take a wild guess and say that the sub out from the amp goes to all four speakers in the back via a crossover hookup.