Question about 2003 GMC Envoy
Check the wiring in the plug connections for loose or broken and touching a live power wire . Check the turn signal modulator for failure.
Posted on Feb 09, 2014
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Posted on Jan 02, 2017
SOURCE: left turn signal on trailer
ok tdknutson, I'm not clear on this, does the truck left turn signal stop working when u plug the trailer in, or is it the trailer left turn signal that's not working, or both? When u plugged in the test light did it show u had power to that plug in? Let me know the answer to the above, and in the meantime, check the ground on the turn signal at the trailer. Make sure it's not loose, and tightly connected to the frame (or wire). Also, what type plug in do u have? 4, 6, 7 wire?
Posted on Oct 27, 2008
it sounds like either the wires controling the left brake light and turn signal are borken or loose on your truck. or there could be a problem with the ground for the trailer hookup. you should take a volt meter and then have someone put the brake on and test at the hook on the truck side to see if you are getting any voltage there and do the same thing with the turn signal. if you do not have any voltage there you need to trace the wires back up into the truck to find where you do have voltage . you may find a broken wire as you go. How many wires are there in your trailer hook up?
Posted on Sep 22, 2009
does the turn signal work on the car if so
the plug on the back of the car is bad
this is a common thing
they dont last very long
Posted on Jan 24, 2011
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