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    1990 gmc 3500 radio HELP

    doing a head unit install on one of these trucks as we speak. Can't locate the front speaker negatives and positives. Does anyone know what color these might be? The diagrams I'm looking at shows colors that aren't even in the factory wiring. Need help asap thanks.






    REFS alot




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    Re: 1990 gmc 3500 radio HELP

    can you take a picture of the harness the actual vehicle harness




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    Re: 1990 gmc 3500 radio HELP

    Quote Originally Posted by meekgj View Post
    can you take a picture of the harness the actual vehicle harness
    Thanks for your help but we got it figured out now






    REFS alot

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    Re: 1990 gmc 3500 radio HELP

    okay




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