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Need Radio wiring diagram 2004 chevy silverado 2500hd (oem plug)

Just want to know what each color wire does, have an interface, just wanna know, the net is running me in onstar or otr stuff in truck, just the radio...

Posted by yenrof on

  • yenrof Jun 13, 2009

    OK, Thanks, now what is the other smaller gauge orange wire located at position 12a on the vehicles harness.
    The Orange-Constant +12 volts is located at 12b on the vehicles harness.
    Took a bulb to the wire at 12a and nothing happens, turn the key on and the fuel gauge needle drops???

  • Israel Adame
    Israel Adame May 11, 2010

    year, make, and model of vehicle



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Israel Adame

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Left Front Speaker(+) TAN ; Size: need Radio wiring diagram 2004 chevy silverado 250 - tab_tech.gif Left Front Speaker(-) GRAY ; Size: Right Front Speaker(+) L GREEN ; Size: Right Front Speaker(-) D GREEN ; Size: Left Rear Speaker(+) BROWN ; Size: Left Rear Speaker(-) YELLOW ; Size: Right Rear Speaker(+) BLUE ; Size: Right Rear Speaker(-) LT BLUE

Yellow -ignition
Orange-Constant +12 volts
Black - ground

If you need more info, please ask.
A rating is appreciated.

Posted on Jun 13, 2009

  • Israel Adame
    Israel Adame Jun 13, 2009

    Smaller gauge wire is dimmer wire. If radio you are installling does not have a dimmer wire, just tape it up.

    Hope this helps.

    Rating appreciated.

  • thecurlings Feb 25, 2011

    My 2004 Silverado 2500HD has only one YELLOW wire. Are both the Left Rear Speaker(-) and the ignition on the same wire?



teddy croft

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My 04 chevy silverado 2500hd doesnt have 2 yellow wires. whats this mean?

Posted on Jul 30, 2015


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Hope this helps.

Rating appreciated.

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