2009 GMC Sierra electrical

Tiny
MIKE1685
  • MEMBER
  • 2009 GMC SIERRA
On my gmc texas edition when I press on my brakes my blinkers light up like my stop lights only when my lights are off though why is this happening?
Tuesday, November 25th, 2014 AT 5:16 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
First check if there's a trailer harness that has gotten chewed up and two wires are touching.

A broken ground wire can cause this symptom too, but most commonly that is also related to a trailer harness that was spliced in with mechanical connectors that don't seal out moisture.
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Tuesday, November 25th, 2014 AT 6:14 PM

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