Question about GMC Sierra 2500

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1989 sierra no brake lights

Brake lights not working,but both signal lights do.replaced switch on pedal,tested fuse panel,traced wires,tested bulbs.brake light on dash is lit,goes out when we unplug abs,any relation?also,only had power to fuse when ignition engaged,perhaps problem with ignition switch?

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  • Mike Butler
    Mike Butler May 11, 2010

    Brake lights should have power at all times on one side of brake switch.

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  • GMC Master
  • 3,433 Answers

The wiring foe the ignition switch and the actual switch is mounted on the lower end of the steering column inside. It's connected to the key switch bt a rod. Check your turn sugnal flasher. it is sererate from your four ways. First

Posted on Jun 02, 2009

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I have a 1989 GMC Sierra c2500. When I press on the brake pedal, my brake lights do not come on. At first I thought the bulbs were burnt out, but when I took the bulb out and tested it with electricity it...


Buy a cheap test light to run simple tests to see where power is being lost. Start at the brake light fuse. Clip the ground lead of tester to a metal bracket or bolt under the dash. Then use the tester's probe to touch the little indents on top of the fuse. There are two indents on each side of tops of fuses-these are test ports to check if a fuse has blown. The brake light fuse will be "hot at all times", so touching the metal strip inside the indent should light up the test light. If not, check if your ground clip is good: turn the key to on. Now every fuse in the dash panel should be powered. Every fuse should light up the tester. If both indents on a fuse light up the test light, that means it is a good fuse. If only one side lights up the tester, that is a blown fuse.
Now back to the brake light fuse, key off. Does it show power? If not, maybe a fuse link off the battery that distributes power to the fuse panel has burned out. If fuse shows power at both ends, move tester to the brake light switch and check for power at the switch-this wire to brake switch is again "hot at all times". Should have power in, and when brake pedal is depressed switch should also have power out. From the brake switch, the brake signal wire goes up into the turn signal switch, and is then routed out to the brake lights. With pedal depressed, you can check for power in and power out at the turn signal connector. Don't pull the connector apart, but back probe the connector with the test light probe. You know the color of the brake light wire from brake switch to the turn connector, so easy to check for power in. Power out should be on two wires, one for each side of the rear lights. If the turn signal switch has power in but no power out, with brake pedal depressed, probably a defective turn switch.
Post back with results, or when you find the problem.
Good luck.

Aug 12, 2013 | Cars & Trucks

1 Answer

No brake lights 2003 Ford Explorer but high mount works


maybe the one of the contacts on the bulb broke or the brake fuse

Aug 06, 2012 | 2003 Ford Explorer

1 Answer

Brake lights don't work how to fix


When a vehicle's brake lights all go out at the same time, the culprit is usually the
"stoplight Switch" which is operated by depressing the brake pedal.

To replace a stoplight switch, first determine what type of switch you have.
If you have an electrical switch mounted to the brake pedal in the passenger compartment:
  • Unscrew the switch.
  • Unplug the wires.
  • Replace with a new switch. Adjust as needed.
  • Plug the wires back in.
If you have a hydraulic pressure switch that is mounted in the brake master cylinder:
  • Mark and disconnect the wires.
  • Unscrew the switch.
  • Screw the replacement switch in.
  • Reconnect the wires
Here's a picture of the "Stoplight Switch", aka Brake Light Switch - 1995 GMC K1500 Sierra

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Brake lights (stoplights) are activated by a mechanical switch on the brake pedal.
To test a suspected bad stoplight switch, bypass it with a jumper wire. The stoplights should light when the wires are connected. Use the test light to see if there is power at one of the lights.
  • If the lights come on when the wires are connected but not when the brakes are applied, replace the switch.
  • If the stoplights operate without the key on, remove the stoplight fuse before removing the switch.
  • If the new switch is adjustable, adjust it so that it is open when the pedal is released.lights should come on about 1/4" after the pedal is applied.

Feb 20, 2011 | 1995 GMC Sierra

1 Answer

Have a 1999 Chev. Suburban. Problem is with brake lights. Top panel (on roof) works but neither side panel works. Replaced circut boards in tail lights, new bulbs, and all fuses are good. What next?


WITH A GOOD FUSE TESTER, TEST ALL THE FUSES FUSEBOX UNDER THE HOOD & INSIDE THE VEHICLE. IF THE FUSES ARE ALL GOOD WITH THE TESTER YOU MUST HAVE A BAD BRAKE LIGHT SWITCH OR A BAD TURN SIGNAL SWITCH. THE BRAKE LIGHT CIRCUIT GOES UP THROUGH THE TURN SIGNAL SWITCH & THEN TO THE BRAKE LIGHTS. FIRST OF ALL IS THE BRAKE LIGHT SWITCH GOOD ? THE ORANGE WIRE FEEDS THE BRAKE LIGHT SWITCH, THE WHITE WIRE PUTS POWER TO THE TURN SIGNAL SWITCH, SO THE LIGHTS CAN BE USED AS TURN LIGHTS OR BRAKE LIGHTS. , PUT A TESTER IN THE WHITE WIRE & PRESS ON THE BRAKE PEDAL. IF THE TEST LIGHT LIGHTS UP, BRAKE LIGHT SWITCH IS GOOD, BY THE WAY THE BRAKE LIGHT FUSE MAY BE LABELED" STOP", THE FUSE LABELED" BRAKE" IS FOR THE ABS SYSTEM. TO CHECK THE TURN SIGNAL SWITCH FOR BRAKE LIGHTS, REMOVE THE PLASTIC COVER FROM UNDER THE STEERING WHEEL, PRESS ON THE BRAKE PEDAL, PUT THE TESTER IN THE SMALL YELLOW WIRE, THEN THE SMALL GREEN WIRE. IF THERE IS NO POWER IN EITHER WIRE, THE TURN SIGNAL SWITCH IS BAD.

Jan 11, 2011 | 1999 Chevrolet Suburban

2 Answers

96 suburban brake ligh don't work


you may have to change the brake light switch at the top of the brake pedal stop by your local GM dealership in the parts department and they be able to print you off pictures and diagrams but check on the part at your local part store because it maybe cheaper wish you the best of luck Michigan Man.

Dec 27, 2009 | 1996 Chevrolet Suburban

3 Answers

1989 Buick Regal brake light trouble


Could be a fuse or relay..
Or try replacing the break light switch..
Its located on the break pedal brace just above the break pedal..

Hope this helps !!
rate me good ;o)

Jul 14, 2009 | 1995 Buick Regal

1 Answer

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Did you check the back-up switch on the tranny, or the grounds??

May 27, 2009 | 1989 GMC Sierra

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I have a 1989 toyota cressida. I have no taillights or parking lights. but there is power to the fuse box. I need a diagram so i can trace the wires


get a haynes manual for your car there about $20 new or you can maybe get a cheaper one on amazon they usualy have a wiring diagram for your car

May 21, 2009 | 1989 Toyota Cressida

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make sure your geetin 12v to brake switch if not jumper a wire then try it

Mar 21, 2009 | 1989 GMC Sierra

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1998 GMC Sierra Signal Fuse Blowing


it seems you have a short in either one of the lights or interlock. all are connected to the same fuse. trace the wiring from the fuse box back to the component. Using a test light test in between the wires. check for any obvious breaks in the wiring.

Dec 06, 2008 | 1991 GMC Sierra

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