No Brake Lights?

The tail lights, turn signal and brake lights do not seem to be working correctly. When I turn the lights on the tail lights lite up. When I step on the brake the driver's side brake light goes out. If I turn the left turn signal on it blinks, but once you step on the brake it does not. We have changed bulbs, fuses and tried to check the wiring but not knowing the wiring schematics makes it difficult.

I have no brake lights and running lights. When my headlights are on only have headlights with headlights off but taillights are dim but roof light works good. Changed bulbs and sockets and I also get a quick flash from turning signals. I asked this taillight question before but this is the whole problem now.

Hi, I recently purchased a 1995 gmc yukon. 4dr, 4 wheel dr. My brake lights, hazard light, and license plate lights don't work, everything else does. It also has what appears to be an aftermarket tow hitch. Under the hood in the fuse box there is a spot marked stop/hazard light on a 30 amp fuse I believe. However it's not a complete ckt. I took the box apart and there is now wire leading to the the metal pronges like the other fuses. Is it supose to be like this? It makes no sense because I have a schematic that says a fuse is suppose to be there, which it is but. Any help is appreciated

I had the same sort of problems. My third brake light worked but not my two rear lights, also my hazards didn't work.I tried various things, but what the problem ended up being was my blinker assembly. After replacing it everything worked. Hope this helps

The tail lights don't light up with the headlights on. They work when I push on the brake pedal and the backup lights work. I replaced all the bulbs and put new cicuit boards in and I also checked all the fuses "there good" Then I looked at the wires and nothing seems to be wrong with them. After checking the fuses and wires, replacing the circuit boards and bulbs they still don't turn on when I turn the headlights on. Can you help me?

The right hand blinker and right hand brake light does not work I have changed the bulbs and the part that the bulbs fit into.

Hi all, wanted to chime in. I just had this issue on my 99 GMC Suburban, 5.7L 4x4.

I went through changing out the switch, tail light boards, bulbs, fuses, etc but did not fix the issue. Finally found a spot to test the voltage for the brake light switch. I was getting 0.7 volts when brake pedal depressed, reading the white wire (brake light control wire). Couldn't find a spot to easily read the voltage for the orange (constant 12v) wire, but could reasonably assume there was an issue with either the brake wire (white) or constant 12v (orange).

The brake light wire harness pigtail is an 8" section that has another connection opposite the end that plugs into the brake light switch, which connects into the main wire harness for the vehicle under the dash. To access it (more easily), you have to remove the plastic knee cover on the lower dash(4 - 7mm bolts) and disconnect the panel vent (un-clips from the panel and then slides out of vent tubing), then remove the larger of the 2 metal brackets (4 - 10mm bolts). Once that plate is off, there is a large square connector that is bolted onto the console frame with one 7mm bolt. Remove that bolt and lift the connector up and off the bracket to give you more room to maneuver the pigtail out. From there you have to remove the adhesive that holds the pigtail to the frame (I used a long flathead and some pent up aggression to get it to break free), and snake the pigtail down to the front. Be careful to not damage the wires on the metal frame while doing so.

When I removed this and checked the wires, my 12v orange wire was damaged and corroded, I then replaced the pigtail with one I got from pick n pull (like 4$) and my lights worked as they should!

I have seen a bunch of posts saying check the white wire, or it gets pinched in the path up to the multi function switch, but if you have cruise control and function of your multi function (turn signals, hazards, etc) my money is on your wire harness pigtail to the brake switch itself.

When you replace the wire harness, make sure you put on a corrugated wire shield to avoid further damage to the cables.

I hope this helps someone else, as it has been a huge pain for me.