Brake light not turning on?

Tiny
GUSTAVOJR21
  • MEMBER
  • 2008 FORD F-250
  • 6.2L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 167,000 MILES
The brake light where my roof is won't turn on when I press on the brake but the LED lights around it does. I can't find the problem.
Friday, May 10th, 2024 AT 8:19 PM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
That truck uses an independent circuit for the CHMSL lamp. There is a fuse (12) and relay in the junction box under the hood that turns that light on. It also has stubs that go to the trailer harness and the OE brake controller. The first item I would check would be the fuse. I have seen the trailer harness wiring corrode and short out and blow the fuse. If it is good and the relay is working, then I would test the wiring at the lamp itself as well as the lamps.
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Saturday, May 11th, 2024 AT 3:41 AM

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