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1989 GMC Wiring Question

I need to know what each color wire is from a delco radio out of my 1989 GMC sierra K1500. There are 6 different wires each with a different color. White, orange, red, yellow, black, and tan.

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  • twcjtrevino Dec 26, 2009

    Could it be possible that there is only one ground wire for the speakers instead of two? this would explain there only being three more wires instead of four.

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Red is power when switch is turned on. Orange is power all the time (runs the clock and radio presets when vehicle is turned off). Black is ground. The other wires are for the speakers and there should be 4 wires. You only have 3 remaining wire colors so there must be one missing. 2 wires per speaker=4 wires. Check again and add to this post.

Posted on Dec 03, 2009

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Here ya go. enjoy!
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