Brake lights not working after installing a new brake booster

Tiny
ANDREWHOWARD71
  • MEMBER
  • 1997 CHEVROLET 2500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
I installed a new brake booster and now the brake lights aren’t working. No power to relay under the hood when the pedal is pressed. What could be the issue?
Sunday, April 10th, 2022 AT 7:03 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
More than likely this is a fuse issue because the brake lamp relay is fed by two fuses.

The first is the stop hazard fuse in the IP fuse box.

I am attaching the info below from the manual on this.

The second is a Maxi fuse in the under-hood fuse box which is fuse 2.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Basically, this is where both power terminals in the relay are getting their power.

So, let's check the wiring diagram below and check these fuses. If the fuse is okay, then we need to check the stop lamp switch and go from there.

Thanks
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Monday, April 11th, 2022 AT 5:39 AM

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