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I need to know where to hook up the key hot wire on a 2005 gmc sierra?

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To find where to hook up your power lead. The best way is with an inexpensive test light. You can get one at the local auto parts house. It looks like a screwdriver with a light-up handle and a wire pigtail on one end and instead of a screwblade it's got an ice-pick like tip.
Connect the aligator clip end to a metal grounding location under the dash, and then with the key on, probe with the pointed end on some of the wiring near the fuse block or under the steering column. When the light in the test light illuminates, you've found a hot. Now turn the key off and see if the light goes out. That will be your hot for the the accessory hot.
Then you'll most likely need to find a constant hot. This will be a wire that illuminates your test light whether the key is on or off. This one is hooked to the hot that is's the one that keeps all your radio stations and the memory items intact when the key is turned off.

So you'll have 2 a constant hot and an "accessory" hot that's only on with the key.

If you need wiring diagrams for your car, let me know.

Posted on Jul 24, 2009


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