Turn signal

2005 GMC YUKON
100,000 MILES • V8 • 4WD • AUTOMATIC
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KATHY HINTZ
  • MEMBER
  • 1 POST
The turn signals blink when turned on, but stop when i step on the brake. What is wrong?
Aug 1, 2017 at 7:25 AM
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CARADIODOC
  • ✓ASE Certified Mechanic
  • 34,321 POSTS
  • ASE Certified Mechanic
Incorrect lamp operation is almost always caused by a bad ground wire. On older vehicles, inspecting the wire harness and where the ground wire bolts to the body usually reveals the break. On newer vehicles, many of them use circuit boards or flexible film circuits that cause a lot of trouble. The clue is only one side is affected, and all the functions on the other side work properly.
Aug 1, 2017 at 6:40 PM
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