Question about 1987 Chevrolet Suburban
They work fine until I turn on headlights then the brake light switches to the reverse light and the blinker stays on
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Posted on Jan 02, 2017
You may have faulty wiring for your trailer lights. Look under the back of the truck where the wiring harness leads to the trailer wiring harness. Usualy it is a 3 way plug in the harness. Try unpluging the harness from the trailer wiring and just plug the other 2 wires into eachother
Hope this works for you!
Posted on Dec 17, 2008
This is a common GM specific problem. Your turn signal switch contains an elaborate networking device that has to cancel brakelights while running a turn light. Often times the ground within the turn signal switch is lost causing your situation. After investigating such other possibilities as fuses and loose grounds it may become necessary to replace the turn signal switch. Thank you, Dana
Posted on Sep 21, 2009
Check for a loose ground. on vehicles the ground is as important as a power wire if not i would suggest taking a closer look at your headlight switch.
Posted on Apr 30, 2010
I've worked on these the first drove me crazy. its the turn signal switch every thing runs thru these. head lights, turn signal, brakes. except the third brake light. it runs directly from the brake switch. go figuare
Posted on Jun 22, 2010
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