I am trying to troubleshoot brake lights not working on my truck

1975 FORD F-100
200,000 MILES
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MANDERS572
  • MEMBER
  • 1 POST
I have changed bulbs, brake light switch, headlight switch, dimmer switch, rear wiring harness, mid harness, fuses, cleaned the ground contacts in the rear housings.. I am puzzled, have all other lights working, turn signals work... running lights work, all lights work except brake lights.. What am I missing?
Mar 11, 2012 at 6:51 PM
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CARADIODOC
  • ✓ASE Certified Mechanic
  • 34,321 POSTS
  • ASE Certified Mechanic
Turn signal switch. They cancel the turn function when that bulb is needed as the brake light.
Mar 11, 2012 at 7:25 PM
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