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Brake lights and hazard quit working

Tiny
DANOC22
  • MEMBER
  • 45 POSTS
With brake on only the brown is hot. My cab brake light and all lights tail, turn, hazard back up all work.
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Sunday, December 20th, 2020 AT 1:21 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What about the white and orange wires going into the multifunction switch?

Roy
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Sunday, December 20th, 2020 AT 5:41 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
The orange is hot brake on or off. The 2 white are not hot brake on or off. Still no power to my brake relay under the hood.
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Monday, December 21st, 2020 AT 10:35 AM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
Any other ideas?
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Wednesday, December 23rd, 2020 AT 10:03 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

I've attached an ABS brake wiring diagram below for you. You mentioned you got the lights working. Are you trying to get a trailer brake to work? Let us know and we'll figure this out. Hope this helps and thanks again for using 2CarPros. Happy Holidays.
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Sunday, December 27th, 2020 AT 1:56 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
My truck brakes have been my problem and still are my problem.
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Sunday, December 27th, 2020 AT 11:56 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
What are these drawings for? I have a 2000 k3500 454 4x4 automatic stander cab. This seems different.
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Monday, December 28th, 2020 AT 12:16 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sorry for the delay, where is the connector from in your picture? Where does that white wire go?

Roy
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Monday, December 28th, 2020 AT 1:30 AM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
The white wire is hanging from the original wiring harness. No sign of it connected to anywhere.
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Monday, December 28th, 2020 AT 9:58 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If you look at the original wire diagram I sent you in the beginning, the white wire is from the brake light switch. It feeds the turn signal switch as well as the brake relay.

Test that for voltage with the pedal depressed.

Roy
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Monday, December 28th, 2020 AT 1:01 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
Should it be hot with brake depressed?
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Monday, December 28th, 2020 AT 1:51 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, it should. Look at the diagram I posted in the beginning and you will see that wire feeds off to several places.

Roy
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Monday, December 28th, 2020 AT 2:01 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
I tested the white wire it's hot when depressed.
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Monday, December 28th, 2020 AT 2:03 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
What does it connect to?
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Monday, December 28th, 2020 AT 2:06 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
I am lame on these drawings. I know it's right in my face. But i'm struggling here.
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Monday, December 28th, 2020 AT 2:15 PM
Tiny
ASEMASTER6371
  • MECHANIC
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It goes to A1 in the wire diagram I sent you for the multifunction switch.

It also goes to the underhood fuse block for power to the relay.

Roy
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Monday, December 28th, 2020 AT 2:24 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
I see where it goes to the stop light switch and to the relay, I don't see what it connect to at the rear of the truck.
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Monday, December 28th, 2020 AT 2:58 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
Do I need to open the harness did it pull out of there?
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Monday, December 28th, 2020 AT 3:00 PM
Tiny
ASEMASTER6371
  • MECHANIC
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It does not connect to the rear of the truck. If you see where it goes to the relay, look down further and it connects to the multifunction switch at terminal A1.

Roy
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Monday, December 28th, 2020 AT 3:05 PM
Tiny
DANOC22
  • MEMBER
  • 45 POSTS
So it just hangs at the rear of the truck?
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Monday, December 28th, 2020 AT 3:10 PM

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