Let our Experts solve your ''My brake lights won't come on Have changed everything except the wiring How do I check that'' I believe it is somewhere in the trunk area. It's a 1994 Buick Regal Custom 3.8L,4 dr

I have to think the problem is inside the turn signal switch, a poor internal connection. You know the brake signal first goes through the turn switch before it goes to the bulbs. That is why the brake lights and rear turn signal lights share the same filament in the bulb, and the same wire going to those lights. The only difference is the turning side light is affected by the turn signal flasher, causing blinking, while the other side- the non turning side-does not go through the flasher relay, but straight to the bulb from the turn signal switch. Change your turn signal switch and I believe you will solve the problem. Let me know, okay?

Check brake light fuse first. If ok, the brake light switch at the brake pedal may be defective. Try wiggling the switch to see if the brake lights work. If not, disconnect the wiring connecter and if it is just 2 wires cross them over and see if the brake lights come on. If they do, the brake light switch is bad. If wiggling the switch makes the brake lights work, I would suggest a brake light switch as well

Check for a blown brake light fuse if no fuses are blown check your brake light switch I believe one of the 2 will be defective and will solve your problem if this was helpful please leave good feedback

All of these responses are surely possibilities but I believe the brake control switch is out of adjustment. A simple look up of how to adjust the position on the switch should solve this issue. It is also possible the switch is broken as everything these days seem to be made of plastic. - - Good luck!

first check to see if you have enough brake fluid in the resevor and that you don't have a leak somewhere. If not you might be able to have a code reader pull the brake codes. If anti lock brakes it might be as simple as changing a sensor. If everything is checking out disconnect the positive battery cable for 10 minutes, this should clear the brake light. As for the chiming you will have to dig around under the dash to find the little noise maker and then unplug it. I just had to do it to my car and truck.

Sorry to hear about your thief... You are correct in suspecting the multi function switch or turn signal switch. If you are confident that you have all the wiring repaired under the hood.. then I believe you are looking in the right direction. Also see if you have brake lights.. this is another system when that switch fails...

Best of Luck...

Try taking all the bulbs out in the back and see if it still blows. If it does its in the wiring somewhere or possibly the brake switch itself. I am suggesting the bulbs or sockets as the culprit because it is also affecting you running light circuit. Lee

Check the grounds on your wiring.
If you have a trailer harness, make sure there are no shorts, or crusty connections

Good Luck chasing the gremlins

there should be a little sensor somewhere behind the brake pedal at the top, if you have checked everything else, try replacing this. (easy job)

you need to check for power and ground at the bulb sockets.
may have a broken wire/ corroded connector somewhere.