Question about 1988 GMC S-15
When the headlights are turned off the turn signals work perfectly. When the headlights are turned on the front turn signals blink out of sequence. Additionally the right rear tailight is lit as if the brakes were on and the left is fine but neither rear turn signal will work.
Try looking for the spot where all your wires come together, near the rear bumper. I was having the same issues until I found the problem today and fixed it. I found a loose ground to the frame the bolt holding multiple grounds was loose. I found it near the rear bumper. I tightened it up and everything started working correctly. Good luck, hope you can find the problem.
Posted on Mar 19, 2009
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Posted on Jan 02, 2017
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