1994 GMC Jimmy brake lights

1994 GMC JIMMY
208,000 MILES • 6 CYL • 2WD • AUTOMATIC
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RATCUT
  • MEMBER
  • 1 POST
top center works great. trailer pig tail and lights dont. cruise control does not work. everything works but brake lights. have wire diagram from alldatapro but cant understand the switches. what do i do now? pedal switch tests okay.
Oct 2, 2008 at 7:22 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi:
If the 3rd brake light works, the switch is fine. Based on what you described (pigtail / brake / parking / turnsignal light don't work) I believe you need to follow the pigtail wiring back to where they have it spliced into the other wiring. My guess is there is dirt, corrosion, and maybe disconnected wires there stopping the power from making it to the lights. Us a test light to determine if there is power to the pigtail and after it. If there is power to it, repair the pigtail. If there isn't power, you have a broken wire or short between the pigtail and the brake switch. NOTE: If you are not blowing fuses, chances are there is a broken wire. If you are blowing fuses, you have a short.

Joe
Oct 14, 2008 at 6:29 AM
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