Electrical problem in GMC

Tiny
JONDECRANE
  • MEMBER
  • 2001 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 164,000 MILES
I have a 2001 gmc sierra 1500, I was welding on the exhaust brackets with the ground of the welder on the tip. I accidently touched the frame and messed up something electrical in my truck. The cruise doesnt work, the turn signals are acting weird and my abs lights on and my odometer randomly turns on and off. When I hit the brakes my turn signals wont work. And when I turn on a turnsignal the other one luminates just barely aswell. Please tell me some reasons that could cause this
Monday, March 14th, 2011 AT 7:15 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you take the battery cables loose when you were welding? At the exterior lamps, check voltage and GROUNDS. Note diagram below, if ground/s look burned or melted, replace wire. Check all bulbs and wiring.
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Monday, March 14th, 2011 AT 7:31 PM
Tiny
JONDECRANE
  • MEMBER
  • 2 POSTS
I didnt unplug the battery- the wires, grounds, and bulbs are all okay. Its not of a computer problem, maybe it messed up my ecm?
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Tuesday, March 15th, 2011 AT 2:41 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Your computer doesn't have anything to do with the lamps we were talking about.

To check for ground, you can use a testlite connected to battery voltage, touch the ground wire terminal, if the lite comes on, the ground is good.
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Tuesday, March 15th, 2011 AT 6:13 PM

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