Question about 2006 GMC Sierra Denali

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When you plug the trailer the lihgts dont come on but the brake&signal lights do work

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  • yadayada
    yadayada May 11, 2010

    use a test light and see if power is present for the running lights at the trailer connector.

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You have a bad ground wire. It will be eithr the ground on the trailer or the car harness. To confirm this diagnosis, take a set of jumper cables and hook one end to the trailer tongue and the other end to the car hitch. If your lights work, then you know it is a ground. The other possibilty is that you have a blown fuse.

Posted on May 09, 2009

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There's a break in the connection on the running lights..either on the car side of the plug or the trailer side.. use a probe light on each terminal of the car side plug with the running lights turned on...if there's power, then the problem is on the trailer... check for a damaged wire near the tongue ...usually the culprit..
Good luck... email if you need more help..

Posted on May 09, 2009

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Hello Carol, The 7 way is for use with a brake controller and/or a trailer that has electric brakes. The 4 way flat is a basic trailer plug connector.
Connect as follows:
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I hope this information is helpful.

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