#Brake light switch wiring harness how to
#Brake light switch wiring harness drivers
#Brake light switch wiring harness manual

Is that one of the turn signal wires Ogre is talking about? The harness also has a third brake light wire that I wasn't going to use, could that be used? Thanks again for all the advise. The diagram has a wire from the relay tapping into 'existing brake circuit'. I am using a 700r4 and got the lockup kit from Bowtie Overdrives. I have thought of another issue that involves the brake wiring. Looks like your setup is what I'm shooting for, is that cleves your e-brake? (did the same thing).

If your LeSabre’s brake lights are not working, it’s most likely going to be caused by a bad brake light switch.Russell, that picture will help a lot. It’s not uncommon for cargo to do this.Ĭonclusion: Buick LeSabre Brake Lights Not Coming On Make sure that the harness wasn’t damaged in there. Check any grounds the harness has in there. You know that it has power before this point since the third brake light is still getting power. If you have the “third” or dedicated brake light (the one not in your tail lights), check the harness after they diverge. There could be an issue with frayed wiring, wiring that has lost its ground, or a short/open situation. If your LeSabre’s brake light switch checked out ok, and there are no brake lights illuminating at all, inspect the wiring harness going from the brake switch to the bulbs themselves. If you can’t find the ground wire at all, run a jumper wire to substitute for the ground wire. If there is a ground wire running to the brake light switch, make sure that it is secured tightly and corrosion free. But, as a general rule, the cruise control switch will not have power going to it when the key is off like the brake light switch does.

#Brake light switch wiring harness manual

You may need to consult your manual to determine which one is which. The other one is to tell the cruise control to turn off when you press the brake pedal. If your vehicle has cruise control, it may appear as though there are two brake switches. When you press the brake pedal down, it sends this power to the brake lights. You do not need to do this.īasically, there are two wires, one is alway hot. He has the brake light switch out of the vehicle, which makes it way easier to see.

#Brake light switch wiring harness how to

The video below shows exactly how to do this. We need definitely need a test light at this point. It ALWAYS should have power running to it, even if the key is off. Your LeSabre’s brake light switch is under the brake pedal. The good news is they are inexpensive and easy to replace.

The most common location is the brake light switch. Ok, now we’ve confirmed that there is power going to the brake light circuit, it’s time to figure out where in the path from the fuse box to the brake lights the power is lost. Make sure to put the same size fuse back inĢ. If it blows more than once, it’s likely that your LeSabre’s wiring harness has been damaged on the way to the brake lights. There is no need to pull the fuse for this. Just hook the clip of the light up to a good ground and touch the two metal tabs on top of the fuse. Wal-Mart and any parts store will keep them in stock, usually at $10 or less. What works better is using a simple electrical test light to determine if the circuit works. You can pull it and visually inspect it to make sure that it is not broken.Įven if it looks fine, if you have another fuse of the same amperage, swap it anyway. It usually says something along the lines of “stop lamps” or stop. The first thing that you should do if all of the brake lights are not working is check the fuse. It is entirely possible that all the brake lights burned out at the same time. Please note that tail lights can work even if the brake lights are burned out. At some point the power is not getting from point A to point B. If none of the brake lights are working, we are going to follow the circuit from the fuse box back to the brake pedal.

We’ll go into more depth on that below.ĭriving without the brake lights working is just as unsafe as if your LeSabre’s brake lights were stuck on. If even one of them comes on, you know that the brake light fuse isn’t blown. You should be able to see the brake lights illuminating the door. Just back up really close to the garage door and push the pedal. You can test whether or not your LeSabre’s brake lights are working all by yourself. The most common cause for this is a bad brake light switch. The good news is that troubleshooting brake lights that aren’t working isn’t too difficult.

If your brake lights aren’t working, you’re way more likely to get rear ended than normal.

#Brake light switch wiring harness drivers

They let other drivers know when you are slowing down, and that they need to slow down too. Brake lights are one of the most critical safety features that your Buick LeSabre has.