1997 GMC C1500 electrical problem with tail lights

Tiny
SPARKYA72
  • MEMBER
  • 1997 GMC C1500
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
I have a 1997 GMC c1500, everything works with the tail light except the brake lights. The all the fuses are good and so is the relay. What could be the problem. I don't know if it has anything to do with the problem, but my problems seemed to start around the time I hooked up to a trailer.
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Wednesday, July 23rd, 2014 AT 7:56 AM

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Tiny
FREEMBA
  • EXPERT
Check the brake light switch located on the brake pedal rod underneath the dash.

The brake light switch will have an Orange wire and an White wire going to it (there may be as many as five wires but these two operate the brake lights).

The Orange wire should have battery voltage on it at all times. The White wire will have power when the brake pedal is pressed.
If this is the case, the brake light switch is functioning properly.

Next check the STOP Lamp RELAY located in the underhood fuse/relay center. To check the relay, simply switch it with an identical relay (Usually you can find one in the very same fuse box). Now, if the brakes lights work you know that the relay is bad.

Finally, check the operation of the hazard light switch. Once the power leaves the brake light switch it goes through the hazard light switch on its way to the brake lights.

**There is a STOP/HAZ Fuse #1 (15A) in the fuse box inside of the vehicle. Also a BRAKE Fuse #18 (10A) in the same fuse box. [I know that you've already checked these, but I wanted to give you a complete answer.]
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Wednesday, July 23rd, 2014 AT 9:29 AM
Tiny
SPARKYA72
  • MEMBER
Thank you very much for your time.I appreciate it. I go through the check list you gave me. I'ill get back to you and let you know what the outcome is/. Again thank you so much.
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Thursday, July 24th, 2014 AT 8:34 AM

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