ok so go to your monsoon amp in your trunk there are two plugs connected to it,unplug those plugs.
One small plug labeled A B C D E F G H and one larger plug labeled A1 TO A12 and B1 to B12
now what you do is connect one wire to the other(SPLICE T TAPS OR HOW EVER YOU WANT TO.
RIGHT FRONT SPEAKER A(light green)+ to B6(light green/white)+
B(dark green)- to B7(light green)-
LEFT FRONT SPEAKER C(gray)- to A6(dark green)-
D(tan)+ to A7(Tan)+
RIGHT REAR SPEAKER A9(dark blue)+ to B5(dark blue)+
A10(light blue)- to B4(black)-
LEFT REAR SPEAKER A11(brown)+ to A4(brown/white)+
A12(yellow)- to A5(brown)-

This may work for years 04-08 with the monsoon amp but like i said i have a 2004 grand prix so this is the only car that i was able to test out.

Questions and comment welcome

Hint one of the plugs is the standard 24 pin radio harness(you will have to move so of the pins around to get the pin out to match)

the other smaller plug i found out where to get it but i don't know a price or if they ever sell to the general public i will have to call on Monday.

Thanks for reading and i am not responsible for your screw up.

ok so i called the company today about the the small male connector and there is a minimum order of 10. So the guy says i will send you one for free and that i should get it buy friday.and like i said the other 24pin harness is just a 24 pin gm radio harness 70-2003.

I will make a plug and play harness no splicing of any wires.

Where did you get the small plug at or do you have a part number for it??? I don't like hacking up the factory wiring if at all possible so if and when i sell the car i can put the stereo back to stock.

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2005 GTP COMP G, Pacesetter Armor Coat Headers, Smoothflow 3.6 pulley, ZZP SSIC, KN Intake, Hptuners

i did a lot of searching and its not sold to the public but the company was nice enough to send me a free sample.They may sell u a bunch of them.ill find the box later on when i get home.