1990 Buick Century install problems

[Gates]

hello,

I am TRYING to install my aftermarket head unit into my 1990 Buick Century.

I have a kit for the car so my head unit will fit. BUT the wiring adapter the person sold me is wrong. is there anyway i can just get a color coated diagram, for what wire is for what speaker, and pos/neg wires? I *THINK* the brownish and red wires are pos/neg wires cause they are seperated from the rest of the wires (on a diffrent imput terminal alltogether actually) but i dont want to fry anything.

any help would be appreciated.

thanx.

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[maylar 10+ year member]

http://www.installdr.com/Harnesses/GM-Wiring.pdf

 

[Gates]

that is EXACTLY what i needed, thank you