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2005 freightliner columbia. replacing factory radio. All wiring is grey :-( Anyone have a diagram showing what pin is what?

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Holding the harness and looking at it as it would plug into the back of the stereo you have 8 wires in the top half of the harness and 4 in Tue bottom. Working left to right on the top half first is the rear left speaker, front left speaker, front right speaker and rear right speaker. The positive speaker wires are on top the negatives are on bottom.

For the lower half of the harness you have 1 wire in the top row and 3 in the bottom. The one on top is the switched wire to turn the stereo on and off with the ignition. The bottom row from left to right is ground, and 2 constant power wires for stereo memory you can use left right or both to connect to your stereo's memory lead. I hope this helps I was looking to and had to map the wires using some educated guessing and a multi-meter.

Posted on Apr 20, 2011

  • lilhazerd Apr 20, 2011

    I apologize I had a couple wires backwards the 1 on top is the memory lead and the 2 to the right of the ground are both switch. Sorry for any confusion.

  • Jay Rock
    Jay Rock Aug 21, 2017

    Wow!!!! Thanks alot... two weeks without a radio until i read this post. Again thanks lilhazerd

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