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No Brake Lights?

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Next make sure the plunger on the switch is being moved when the pedal is moved, does pushing on switch by hand change anything? Check and makesure the third light isnt burned out and recheck for brakes.

You may want to check for damage in the harness inm cab next since all 3 dont work.
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Monday, July 27th, 2020 AT 10:30 AM (Merged)
Tiny
LALA0409
  • MEMBER
  • 1 POST
  • 1999 GMC YUKON
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
The tail lights, turn signal and brake lights do not seem to be working correctly. When I turn the lights on the tail lights lite up. When I step on the brake the driver's side brake light goes out. If I turn the left turn signal on it blinks, but once you step on the brake it does not. We have changed bulbs, fuses and tried to check the wiring but not knowing the wiring schematics makes it difficult.
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Monday, July 27th, 2020 AT 10:30 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,949 POSTS
Hello,

It sounds like you have a fuse out or the hazard/turn signal switch that is not working right. Here is a guide to help you see where you are loosing power:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Here are the wiring diagrams for the rear lights, please let me know if you need a larger version.

Check out the diagrams (below).

Please let us know what happens.

Cheers, Ken
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Monday, July 27th, 2020 AT 10:30 AM (Merged)
Tiny
JOE DENALI
  • MEMBER
  • 13 POSTS
  • 1999 GMC YUKON
  • 70,000 MILES
I have no brake lights and running lights. When my headlights are on only have headlights with headlights off but taillights are dim but roof light works good. Changed bulbs and sockets and I also get a quick flash from turning signals. I asked this taillight question before but this is the whole problem now.
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Monday, July 27th, 2020 AT 10:30 AM (Merged)
Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Welcome back.

May I ask if you are using LED bulbs in this?

Rich
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Monday, July 27th, 2020 AT 10:30 AM (Merged)
Tiny
KT_THEONE
  • MEMBER
  • 1 POST
  • 1995 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
Hi, I recently purchased a 1995 gmc yukon. 4dr, 4 wheel dr. My brake lights, hazard light, and license plate lights don't work, everything else does. It also has what appears to be an aftermarket tow hitch. Under the hood in the fuse box there is a spot marked stop/hazard light on a 30 amp fuse I believe. However it's not a complete ckt. I took the box apart and there is now wire leading to the the metal pronges like the other fuses. Is it supose to be like this? It makes no sense because I have a schematic that says a fuse is suppose to be there, which it is but. Any help is appreciated
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Monday, July 27th, 2020 AT 10:31 AM (Merged)
Tiny
PAULIX69
  • MEMBER
  • 1 POST
I had the same sort of problems. My third brake light worked but not my two rear lights, also my hazards didn't work.I tried various things, but what the problem ended up being was my blinker assembly. After replacing it everything worked. Hope this helps
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Monday, July 27th, 2020 AT 10:31 AM (Merged)
Tiny
SHNF297
  • MEMBER
  • 1 POST
  • 1994 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 134,000 MILES
The tail lights don't light up with the headlights on. They work when I push on the brake pedal and the backup lights work. I replaced all the bulbs and put new cicuit boards in and I also checked all the fuses "there good" Then I looked at the wires and nothing seems to be wrong with them. After checking the fuses and wires, replacing the circuit boards and bulbs they still don't turn on when I turn the headlights on. Can you help me?
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Monday, July 27th, 2020 AT 10:31 AM (Merged)
Tiny
INTERNETMECHANIC
  • MECHANIC
  • 700 POSTS
The brake lites aren't supposed to come on with headlites. Are you talking about tail lites?

The brake lites only come on when you activate the brake switch, step on the brake.
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Monday, July 27th, 2020 AT 10:31 AM (Merged)
Tiny
TONY WORTHAM
  • MEMBER
  • 1 POST
  • 1994 GMC YUKON
  • V8
  • 4WD
  • 257,000 MILES
The right hand blinker and right hand brake light does not work I have changed the bulbs and the part that the bulbs fit into.
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Monday, July 27th, 2020 AT 10:31 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

The power comes from the turn signal switch for the right rear brake and turn.

The first thing I would do is to check for power to the connector. Use a test light or voltmeter to verify.
If you have no power then you need to go to the turn signal switch. Check the dark green wire from the switch.

Roy
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Monday, July 27th, 2020 AT 10:31 AM (Merged)

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