What is Dimmer wire on my wiring harness for?

Which wire is the 12 volt power source on a 2006 Ford Expedition factory stereo wiring harness?

  • I'm adding an aux input adapter to a 2006 Edpedition with factory radio that needs a constant 12 volt power source. I'm not sure what color wire I should connect it to for a power source.

  • Answer:

    use a test light ground it out on metal and touch the tip of the tester inside of the harness the one that lights it up is your power line (with the key off)

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I think it is always the yellow BUT NOT POSITIVE

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