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RAN A HARDWIRE FOR MY GARMIN GPS BEHIND THE CENTER VENT ON MY HUMMER H3. NOW THAT I HAVE IT BEHIND THE DASH IT'S HANGING BY MY FEET AND DON'T KNOW WHERE TO CONNECT THE WIRES?

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  • wynne29 Jul 23, 2009

    It is a nuvi 770. but I don't think that's relevant. what I need to know is where to connect the black and red wires to get power. I want the power to shut of when th ignition is off.

  • wynne29 Jul 23, 2009

    No good ! I have a 2008 Hummer H3 with no cigarette lighter. I do have 2 12V power connections, however they do not turn off with the ignition. Need another source ID'd

  • wynne29 Jul 24, 2009

    this sounds fine. except the fuse box is in the engine compartment and i see no easy way through?

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There is really only one way to find a switched hot, and that's to use a meter under the dash. You will have to locate a 12 volt+ wire and then turn the key off to check it. It's that or use a 'wire clothes hanger,' straighten it out and push a wire through the fire wall, there are some holes going through already. It's doable. Then just route it over to the fuse box, and there are plenty of options there. It is really the way to go here. if you take it in to the shop, this is what they'll do, so you may as well do it and save a bundle. The black wire just goes to a ground point (any screw).

Posted on Jul 24, 2009

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The best way to solve this is go straight to the fuse block. There is a "bus jumper" made for this application. A buss jumper is a little metal piece that fits in the slot with the fuse and lets you tie a wire in with its power source. You will need to use a multimeter or a test light to identify which fuses have power only when the ignition is on. Tie the buss jumper in to that fuse and re run the wire to the GPS. Now when you turn off the key the power on the unit will die. Hope this helps. Please re-post with updates or questions. If you feel that this solution has then please accept and rate. Thanks cj2176.

Posted on Jul 23, 2009

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Hi there,

Can you please tell me what model Garmin GPS you have?

Posted on Jul 22, 2009

  • Dean
    Dean Jul 23, 2009

    Well the wires are for a 12 volt power supply to hook up to your cigarette lighter outlet. So if you wired those to your cigarette lighter plug correctly (red for positive, black for negative/return) then the cigarette lighter plug should also be wired to your ignition system to only apply power when the key is in the ignition etc.

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