Question about 1991 Ford F150

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Trailer wiring just re-wired for a pop-up trailer with a hopkins kit. when the truck lights are off, everything works fine. however, when the truck lights are on the trailer brake lights don't work. everything else seems fine

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Make sure you have a good trailer to truck ground. Check the white wire on the trailer harness and make sure you have a good clean contact at the trailer ball. This is a ground source between the two.

Posted on Jun 30, 2008

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http://www.etrailer.com/t1-1992_Jeep_Cherokee.htm

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