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Brake Lights 2003 2500HD Duramax...main brake light fail..third working correctly..bulbs, flashers, wiring, sockets all check good...any suggestions?

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2 Answers

Brake lights don't work but third brake light does


I believe the flashers are on a different circute. It sounds like a bad ground.....or one of your taillight sockets is bad. I have a cavilier that had the same problem. I went to a junk yard and found some light socket s and swopped them. So far it has been working. The third light has its own ground. tail light sockets need to have a good ground, some times the ground from batt. to block, ground frome block to frame can be bad.
Think "ground"
Don't try and buy new sockets , unless they are just like the fasctory sockets. getting the entire tail light works good. Find the main tail light, the juce comes to it first, then passes to other side. Check that dide frst. work your wat over to other side, if u cant find a problem, work your way to the front and find out where the lights are grounded.
good luck
Doug

Apr 10, 2012 | 2005 GMC Yukon Denali

1 Answer

All rear lights blink when i use turn signal.


Failed ground wire, no doubt caused by corrosion. Check under the vehicle at the rear or in the flasher bulb areas. Your main rear lighting common earth wire is the culprit. If you cannot find the corroded wire, then go to any rear bulb and attach a grounding wire from the bulb ground to the chassis. This will 'repair' the other missing ground feeds. The indicator is being grounded through the other bulbs circuits, rather than to vehicle chassis. You need to locate a circuit schematic and check the ground point locations. It could be anywhere unfortunately, so adding a new ground wire is the alternative grounding replacement method.

Sep 07, 2017 | Cars & Trucks

1 Answer

The brake lights does not work when I have the light on. I think the car is not wired correctly. Also the third light won't turn off when I have the lights on.


check the brake light switch on the brake pedal for the third brake light staying on. check the bulbs in the rear of the car for the lights not working.if the bulbs are good then check for power to the light sockets.

Aug 08, 2011 | 1998 Honda Accord

1 Answer

No rear brake lights, but 3rd one works. Fuses good, relays good, pedal area good, bulbs new, and new circuit board. What now


Im not sure the make ,year or model of your car but , the next thing to check as you already checked the fuses and brake light switch would be to check the wires going into the socket, the sockets go bad often so using a test light the next thing is to check the power and ground right before the socket, check the wires at the end before they enter the socket, if you have power and ground then the sockets are bad. you also know that the brake lights and the third light use diffrent power sorces, so just because the third light works doesnt mean the fuse is good for the other brake lights,good day,

Mar 29, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Third brake light works turn signals and hasard


Check the bulbs everything runs as you said the 3rd brake light works correctly so should they all. Otherwise it may be the socket could be corroded check to ensure this is not your issue.

Nov 07, 2009 | 2000 Chevrolet Cavalier

1 Answer

Brake lights


If you have an aftermarket trailer towing plug on it, that's where i would look first. Something is shorting out in there, or you have a broken wire or ground somewhere. Proabably near the back where gravel stones can hit.

Oct 07, 2009 | 2003 Chevrolet Silverado 2500HD

7 Answers

1996 Chev Silverado K3500 dually, no brake lights


Check at the light socket in the rear, where your lights don't work. You need a test light or a voltage meter, and check to see that you have a groun there, power for your parking light, and power to the brake light. You should have power for the parking lights seeing that it works, and a ground. Just verify that your power for the brakes is getting to the bulb, or not. Just a good place to start.
And you are correct that if the third brake light works (top) your brake light switch is fine.

Aug 19, 2009 | 1996 Chevrolet C3500

1 Answer

I've checked all the components, relay, pedal switch, fuse, bulbs and I still don't have brake lights. The third brake light works but no brake lights, every thing else works, tail lights, flashers and...


The mechanic needs to check again the connection of the brake light to the fuse and the wires . then try checking terminal sockets of the brake light that can also be the problem.if still not working try to look at the sensor .

Aug 11, 2009 | 2003 Ford E150

1 Answer

2006 Chev Impala turn signals not working on rear lights, turn signal flashing at a faster rate than normal, No brake lights when pushing on brakes.


Two issues here, you will need to replace the flasher. this will correct the erratic turn signals.

Concerning the brake light. Make sure the bulbs are in working condition and, check the wiring harness for faults as well. if the bulbs and wires arr OK, replace the brake light switch.

You can test for proper current by pulling the brake light bulbs out the socket and, use the copper prongs inside the brake light socket for testing. use a volt meter and, hit the brake pedal and, see if the meter registers a current. if not, replace the wiring harness.

Jun 04, 2009 | 2006 Chevrolet Impala

1 Answer

Brake Light trouble!


the tail light lenses are most likley the problem. the sockets will also have to be replaced . try moving the backup light sockets to the brake light sockets . you should be able to get one working. this is for test purpos. at least you will know if it is the problem. good luck

Oct 24, 2008 | 1999 Plymouth Grand Voyager

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