Question about GMC K2500

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What color wire do i need to connect the wire coming from my electric brake box to the brake pedal switch

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  • David Burns
    David Burns May 14, 2015

    2002s-10 I am hooking up elect. Breaks I have every thing working but the power to breaks when I apply breaks ?

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  • GMC Master
  • 7,772 Answers

Hi, I would need your model and year to find the color. Alternately, you can use a 12 volt test light to find it yourself. Just take the connector off, hook your test light clip to a metal spot under the dash, and probe both terminals in the switch. The wire that DOES NOT light the test light is the one you need.

Posted on May 22, 2011

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Posted on Jan 02, 2017

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How to trouble shoot no brakelights?


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Jul 11, 2014 | 1986 Dodge D150

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Checking the Brake Light Switch: A control switch is used to connect the brake...


Checking the Brake Light Switch: A control switch is used to connect the brake light electrical circuit. This switch is located near the brake pedal lever. Basic switches have just two wires, power in and power out to the turn signal switch. Use a test light that is grounded and with the key in the "on" position test for power at one side (wire) of the switch, then press the brake pedal while testing the opposite side (wire). It should illuminate the test light, if electrical power is connected through the switch go to the next step. If no power is detected through the switch the brake light switch has failed and replacement is required. If your car is equipped with more than two wires integrated into the brake light switch a car repair manual is needed to locate the proper brake light circuit wiring.

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No brake lights


There must be an error code when such problems occur. Electrical Load Sensor (ELS) determines the status of the electrical system if any electrical load is applied when the car is moved and send this signal to the ECM. Please try to retrieve the CEL error codes, if any. Otherwise check the following:
1. Brake stop switch fuse (mostly 10 Amps and red in color) under the glove box on passenger side.
2. Brake switch connector located at the foot brake pedal.
3, Harness wiring.
4. Tail lamp assembly or bulbs.

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Brake lights won't work replaced the fuse and the bulbs still nothing what can it be?


Find the brake light switch up under the drivers side of the dash. It will be mounted on a bracket near the brake pedal lever. Make sure one wire has power to it all the time. Make sure one of the other wires has power when the brake pedal is depressed. If no wires have power when depressed the switch is bad. If the wires have power than you probably have a bad turn signal switch. I can probably get you specific wire colors if you need them. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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When i hit the brake peddle my break lights do not come on i have cheaked both fuse boxes and looked at the baulbs and wireing what else is there to look at


There is a sensor behind the brake pedal arm, looks like a button touching the back side of the brake pedal arm. It should depress as you push the brake and it turns on your brake lights. If it`s not touching the brake pedal arm when you depress the pedal, you need to adjust it.

Apr 15, 2011 | 2002 GMC Envoy

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

How to replace a brake light switch on a 1998 GMC Sierra 1500.


Hello my name is Israel and I will be glad to help you. Above the brake pedal there will be a small white in color switch with two wires coming out of it. This is the brake switch. You will need to pull the pigtail from the brake switch and then "unscrew" the switch and replace with new one. Connect the pigtail. Adjust the switch so that the brake lights activate with a touch of the brake pedal. Good Luck.

Feb 14, 2011 | 1998 GMC Sierra

1 Answer

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Hi. There is a grey plug with 6 wires right behind your OBDII diagnostic port on the lower dash board above your accelerator pedal.

The color of the wires on the plug are blue, green, red, white and brown. The wires are as follows:
Blue....electric trailer brake feed
Green....brake pedal switch
Red...12v postitive...always hot
White....ground
Brown....interior vehicle illumination (not used)

The factory wire harness that you will need to attach your brake controller will plug right into this plug. The factory wires are colored the same as above.

After-market and brake conroller wires are colored as follows:
Blue....electric trailer brake feed
Red.....brake pedal switch
White....ground
Black....12v positive

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1 Answer

Brake lights don't work change everthing


behind your brake pedal is a switch of some sort. it tells the brake lights to come on. check your fuses in the fuse box, and push the brake pedal with your hand and look how the brake switch hits the brake pedal ? is it touching and connected to the wires.

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