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Brake lights stay on

Fuses ok,need to know wiring for ground

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You problem could just be that the brake switch is out of adjustment or bad.It is located on the brake pedal under the dash.Try pulling up on the brake pedal and see if the lights go off.By pulling up I mean grab the pedal with your hand and pull towards you.The opposite of when you step on the brakes with your foot.If they still stay on you will have to go under the dash and disconnect the brake switch connector and see if the lights go off.There might be 2 switches on the pedal.One is for the cruise shut off and the other the brake switch.Hope this helps.Good luck.

Posted on Feb 18, 2012


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1994 dodge dakota brake light ground location

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Chevy cavalier - rear brake lights don't work. The center rear brake light does work as well as all other lights. Replaced the bulbs and fuse - no luck. From what I have been told, the turn signal...

Stop Lamp Circuit Description
The STOP HAZ fuse in the IP junction block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to the center mounted stop lamp (CHMSL) and both left and right stop lamp assemblies. The left stop lamp is grounded at G304 and the right stop lamp is grounded at G304.

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Stop Lamps Inoperative

Inspect the 20 Amp STOP HAZ fuse.
Is the STOP HAZ fuse open?
YES - Go to Step 11
NO - Go to Step 3
Use a test lamp in order to backprobe connector C1 of the brake switch connector between terminal A and ground. Refer to Circuit Testing in Wiring Systems.
Does the test lamp light?
YES - Go to Step 4
NO - Go to Step 5
With the brake switch closed, Test for positive battery voltage at terminal B of connector C1. Refer to Circuit Testing in Wiring Systems.
Is voltage present?
YES - Go to Step 6
NO - Go to Step 7
Repair the open or short to ground in the Fuse Output-Battery between the fuse block and the brake switch. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
YES - System OK
Use a test lamp in order to backprobe the turn/hazard headlamp switch assembly connector C2 terminal A and ground.
Depress the brake pedal.
Does the test lamp light?
YES - Go to Step 8
NO - Go to Step 9
Inspect the adjustment of the brake switch. If the adjustment is correct, replace the brake switch.
Is the repair complete?
YES - System OK
Replace the turn/hazard headlamp switch assembly.
Is the repair complete?
System OK
Repair the open in Stop Lamp Switch Output between the brake switch and the turn/hazard headlamp switch assembly. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
System OK
With brake switch open test terminal A of the brake switch for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
YES - Go to Step 11
NO - Go to Step 12
Repair short to ground in Fuse Output-Battery Circuit. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
Test the Stop Lamp Switch Output Circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
YES - Go to Step 13
NO - Go to Step 14
Repair short to ground in the Stop Lamp Switch Output Circuit. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
Test terminals F,G,B and C on the Hazard Warning Switch for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
Go to Step 15
Repair short to ground in suspect CKT. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK

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1 Answer

Blowing brake light fuses 1988 E150. Brake switch

To Track down the problem you need to disconnect the Battery and use a Multimeter set to OHMS.

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If it is a wire problem, keep tracing the grounded wire until you find a connection you can unplug to make the Ohmmeter drop. Remember the overhead Brake light on the roof. You may have just worked on the Taillights. The bad wire may be grounding in the roof or on the frame.

Once you isolate the bad wire you may want to run a new one.

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In order of probability......
1,brake light bulbs.
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I've had a similar problem is so matter what i do the lights would stay on dim. My solution to my problem was that I had a bad/loose ground.

To your problem with the high mount break mount staying on is that you have a loose ground or a tear in the wire.

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Troubleshooting Procedures - Read Completely Before Beginning
(American Car) All Brake Lights Not Working
  • Check System Fuse: A fuse is used to protect the brake light circuit from amperage overload. If the fuse has failed it will not allow the electrical current to continue to the brake lights. To check the fuse, first locate the brake light system fuse in the fuse panel which is either under the dash or under the hood in the power distribution center. Connect the test light to a ground like an engine or dash bracket and turn the ignition key to the "on" position. Using the test light probe both sides of the fuse. If the test light illuminates on both sides the fuse is ok continue onto the next step. If one side of the fuse illuminates the fuse has failed and needs to be replaced. If the fuse fails as soon as it is replaced or when you apply the brake pedal the brake light electrical circuit is shorted to ground. Rarely a system short can occur, a car repair manual is needed to find the wiring schematic for the brake light circuit. Once the brake light wiring has been located inspect and repair as needed.
  • Check Brake Light Bulbs: All cars have three brake light bulbs that create the brake light illumination affect. If all of these brake light bulbs fail no brake light operation will occur. I know what you're thinking, you might say all three brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove any of the brake light bulbs to confirm the bulb is ok or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are ok continue to the next step.
  • 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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2 Answers

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you need to follow the ground wire for that socket... most likely two ground wires... unscrew it from the frame and clean it up so it makes a better contact... reattach it and should be good to go.


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