No brake lights?

Good evening,

I attached a wiring diagram below for you to view.

There is a fuse for the brake light switch. Check for power there and at the switch. They are in the diagrams I attached. Make sure there is power on both sides.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

The power goes to the stop light switch and then off to the body control module. The switch sends a signal to the body control module and the module sends voltage to the brake lights, all of them.

You need to start with checking the fuses and check for power at the stop light switch both in and out.

https://www.2carpros.com/articles/how-to-check-wiring

Roy

Electrical problem
2002 Chevy Truck V8 Four Wheel Drive Automatic
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no brake lights on 2002 chevy silverado,put in new fuse,press brakes fuse blows,

Is the truck wired for towing? If so often this added wiring will chafe and go to ground.So check this out.
If no hitch wiring check the bulbs they can short and cause the problem.
Good luck

I have a 2000 cavilier and the third light brake light works but the other two don''t.I replaced the bulbs and checked the fuse .What else could be the problem???
Tthank You

Wouldn't surprize me if the sockets were bad.

yup , we went through so many of them at the dealer i was at we couldnt keep them in stock

Have no brake lights. Have changed the bulbs and fuses and the part above the brake pedal. The rear light on top of the back hatch door does not work either.

Any suggestions. Thank you.

next step is to check the wiring going back to the brake lights also check the connectors to see if any are unplugged see if anything else is not working to as this could be an indication of a wiring connector coming unplugged

The third brake light on the cab works. I have replaced the brake light switch, but it still doing the same thing?

Hi and thanks for using 2CarPros.

The first thing I suspect is a bad ground. Both tail lights have a common ground. However, the third brake light has a different one.

What I suggest is this. First, remove the light assembly and locate the wiring to the brake light bulb. Have a helper press the brakes while you check for power to the yellow wire on the left light assembly and dark green one on the right side assembly. Make sure you have a good ground for the test light. If it turns on when the brake is applied, then you have a bad ground.

I attached a picture for you to see the brake lights and their ground. It indicates where the ground is located and the color of the wires.

Here are a few links you may find helpful when performing the test:

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

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know if this helps or if you have other questions. And, I hate to ask this, but are you certain the bulbs are good and the correct ones?

Let me know.

Joe

I have no brake lights, turn signals work great, changed bulbs, changed brake light switch, checked the pig tail, only the third brake light works, where do i go now?

Your lower brake lites are wired through the turn signal switch. At the lower rear, brake and turn use same bulb filament, just not at the same time. The white wire carries voltage to turn switch for lower brake lites. The high-mount brake lite is not wired through the turn switch. The brake lite feed from turn switch, dark green for right side, yellow for the left.

The brake lights come on and are working fine when I first apply the brakes, as I push harder on the brake the relay trips and cuts them out. Release the brake slightly and relay closes back and brake lights come back on. I have change the relay thinking it was weak and that has not cured the problem. There is no third brake light. checked all wiring and can not find a problem. Truck is equipped with trailer brake controller, I have unhooked it completely and problem is still accuring.

The relay you replaced, is it the brake switch at the brake pedal or another one under the hood somewhere?

It sounds like you are describing a failed brake pedal switch. Also, the third brake light is on a separate circuit than your rear brake lamps so will not be a symptom.
One follow up question, do either of your turn signals work properly? Try them with the headlamps turned on and off and we'll see what we can do.

Regards,

it was the relay under the hood, and yes all the turn signals work fine.

That's great news! You have a simple fix of replacing your brake pedal switch located on the lever part of your pedal. It is easy to install, practically just pops out and in, and can be found at any parts store.

Make sure it is adjusted properly once you put it in. with the brake pedal at rest (not depressed) move the switch towards the pedal until the plunger is fully depressed.

Regards,

Electrical problem
1997 Chevy Truck V8 Two Wheel Drive Automatic

My brake lights and rear turn signals do not work

Hi, your lower brake lites and turn signals, use the same bulb filament at the rear, just not at the same time. They are wired through the multifunction/turn switch. You can go ahead and check voltage and ground at the rear. Ground wire is black, it may be a dual filament bulb, the other filament is tail lamp, brown wire, the other color wire has to be turn/brake. The high mount brake lite, where applicable, is wired differently.

I have a 1997 chevy truck and the brake lights, back up lights, and signal lights in back arn't working. I checked the fuses and relay box under hood and everything looks ok. Had a bulb out in back and it has been replace but still nothing. When I turn lights on at night, I do have lights in back of truck, but still no brake lights, reverse light, or signal lights.

Use a voltage tester on the proper wire in the diagram. At the rear, brown wire is voltage for tail lamps, The other color wires are voltage for brake/turn. The info I looked at was for c1500.

Check the black wire in the diagram for proper ground.

how would I check this? All my brake light fuses work, but my brake lights still will not work. I know the voltage under pedal should be 12, but I am not sure how to check to see if this is the problem.

put a test light to the white wire and it should light when you apply the brakes. also the orange wire should be hot at all times. if light on orange wire but no light on white, replace brake light switch, if light on both suspect turn signal switch, hope this helps

left brake light is not working. have replaced bulb and circuit board. tail light and turn signal work fine. PLEASE HELP

Hello, I'd have to check the turn switch. Your lower brake lites and turn signal are wired through the turn switch, use the same wiring circuit and bulb filament, just not at the same time.

1998 C1500 5.0. My brake lights have recently stopped working on my truck. Both of the brake lights in the tail lights would not work and one of the two lights on the cab brake light was not working. It turned out to be a bad buld in the cab light so they are fine now but the tail lights still are not working. I can hear the relay working properly, the parking , reverse, and turn signals are fine just the brakes. When the brakes are pressed it is getting about 12.5 volts to the socket (between the positive and the ground in the socket) but still no lights. I can visibly see the bulb is fine but even tried it with others just in case and still nothing. The ground seems to be fine, the power seems to be there, this makes no sense to me anyone have any ideas?

*After checking many different scenarios I found that the socket is getting 12v when the bulbs are out of both lights but if I put a bulb in either light it will not read any voltage at either light. Does anyone know what would cause this?

Have you resolved this issue (I see it's been almost 2 months since your post)? I have the same truck, and the same issue with my right rear turn signal. Same symptoms. Bulb is fine, voltage is fine. I found that the di-electric grease (tan colored gunk inside the bulb socket) had dried up, turned a dark brown color, for whatever reason. I used a fine-tipped tool to scrape the old crud out of the socket, and sure enough the light once again worked like a charm. However, this only worked for about a month, and now the light works intermittently. I am going to replace that plastic socket assembly (the thing that holds all 3 bulbs) and see if that fixes it.

1998 Chevy Pickup, 165,000 miles. I have no brake lights, the third light up top works fine, as do all running lights, turn lights, back up...but no brake lights. I have replaced the brake switch( 2 of them, one was DOA out of box!) , brake relay under the hood, all bulbs. I have traced all wires all the way to the back, they are fine. I can take a wire that is 12v hot and touch it to the wires that go back and I get brake lights. Is there some part that makes the turn signal and brake power go together or is it done in the break switch? What other parts are in the system?

THANK YOU FOR YOUR TIME AND HELP !!!!!!!!!!!!!
George

The highmount brake light feeds from the brake switch and the lower brake lights run through the turnsignal switch assembly. More than likely you have a faulty turnsignal switch....

Cly

Ok, I was thinking that my problem was somewhere in that area. Where could I find the turnsignal switch assembly at??? Is that where the power 12v from brake light and signal come together??? THANKS FOR YOUR HELP !!!!!!!

The turnsignal switch is located in the steering column. You have disassemble the top of the column to replace it..


Cly