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My brake lights do not work?

Tiny
ZDAILY
  • MEMBER
  • 1994 CHEVROLET SILVERADO
But do with the key off. My brake switch works and has power but not the multifunction switch. I have traced it through the dash but it dissappears behind the gauges. I dont know where the brake switch and the multi switch intersect
Wednesday, October 10th, 2012 AT 2:28 AM

14 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Do the brake lights work with the key off?? this guide can help us fix it

https://www.2carpros.com/articles/brake-lights-not-working

Roy
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
ZDAILY
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  • 26 POSTS
Yes they do, but ive been messing with so much that just now they do not
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Except for the high mount brake light, the other stop lights are linked to the hazard/turn signal switch and that shuld be the component you should be looking at for the fault.

Refer to the schematics.
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
ZDAILY
  • MEMBER
  • 26 POSTS
There is no power going to the signal switch. This is where I am getting stumped
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
ZDAILY
  • MEMBER
  • 26 POSTS
I have a new switch and that did not change anything. There is no power to the switch in general
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
ZDAILY
  • MEMBER
  • 26 POSTS
The yellow wire from the brake switch has power. But the white wire that connects to the signal switch has power for a seconds and then dims to nothing. This is with the key on. Why would this happen?
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
When power to White wire fades, check Yellow wire again. If power is available, the brake switch is the one causing the problem.
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
ZDAILY
  • MEMBER
  • 26 POSTS
So I just installed a new brake switch and that did not fix my problem. And the grounds in the back near the lights are all good. I am losing power in between the signal switch, and the brake switch. Is the wire grounded somewhere in between that might have rattled lose?
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
ZDAILY
  • MEMBER
  • 26 POSTS
The yellow wire from the brake switch, is spliced to 4 other yellow wires, from there two wires run up and behind the dash. Another runs to the relays that still has power and the other runs to a junction that is connected to 5 other wires that also stays hot. The 2 wires that run up and behind my dash, I don't know where they lead but a white wire comes from there back down and to the signal switch. What happens in between?
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You did not specify the exact model of your vehicle resulting in me posting the wrong schematics previously. Here are the correct schematics.

The two wires going up to dash should be for the the cruise control and auxiliary usage.

Inbetween is the center high mount stoplight relay, which is located at right hand side of cowl, in engine compartment. The White wire to signal switch must have battery voltage when brake switch is operated. If no voltage is present you need to check the relay.
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Sorry, forgot to include these.
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
ZDAILY
  • MEMBER
  • 26 POSTS
Thanks for helping me narrow this down. I found it the other day and it was the ground in the engine compartment that bolts to the engine. I traced the wire all the way through the dash and into there. It was a little ridiculous but worth it. Thanks alot
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You're welcome. Glad to know you have the problem fixed.
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Monday, January 25th, 2021 AT 6:19 PM
Tiny
DEVELOPER7
  • MECHANIC
  • 42 POSTS
Great job sticking with it, electrical problems take a lot of patience. It is great to see that so many people have the skills to fix their own vehicles and that experts are here to help.
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Monday, January 25th, 2021 AT 6:19 PM

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