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Is there a separate wire for brake lights only on semi trucks?
Wiki User
∙ 11y ago
Yes.
Wiki User
∙ 11y ago
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Brake lights don't work when the brake is pushed. Work with headlights on only.?
The brake lights and the tail lights are separate circuits. Check the brake light fuse, then check the brake light bulbs, then check the brake light switch.
Brake light only work on top of hatch on 1997 jimmy gmc replaced bulbs?
There might be a separate fuse for the lower brake lights ( just a guess )
Why brake lights come on only sometime?
sometime only brake!
Why does the brake light not light up when you turn on the light but it light when you brake?
This is operating as intended. Brake lights are only activated when the brake pedal is pressed, irrespective of the other lights in use. It is a safety feature so vehicles behind are aware the brakes have been applied. They are separate from the tail lights so they still give a visual indication of braking whether the other lights are on or off.
Why does your tail lights only work when you press on the brake?
Are you saying your tail lights themselves do not work and only the brake lights work. If that is the case, check the fuse, and then check the tail light bulbs.
Why are your trailer brake lights staying on when you turn your headlights on?
First you need to understand that most, if not all, vehicle [autos, trucks, and trailers] rear lighting systems have both tail light bulbs and brake light bulbs, OR a single bulb on each side [right and left] that each have two filaments [what glows when electricity is applied]. The tail lights are supposed to be on when the headlights, or parking lights, in the towing vehicle are turned on. The separate brake light bulb, or brake light filament in the dual filament bulbs is only supposed to turn on when the brake pedal is depressed, and the towing vehicle brake lights are on. I suspect that what you are calling brake lights are actually the tail lights. To check this out, run some tests. Have an assistant sit in the vehicle and do the following on your command: 1. Apply brakes by pressing on the brake pedal. The brake lights should turn on. 2. With foot OFF of the brake, turn on the headlights. The trailer tail lights should turn on. 3. With the headlights on, have the assistant depress the break pedal. Even though the tail lights are already on, the brake lights should come on also, causing the trailer lights to brighten noticeably 4. While you're checking, have the assistant turn the ignition key to on, and one at a time test the left and right turn signals. Again, I think what you think are brake lights, are actually the tail ligts.
What would make your brake lights not work?
The most likely cause is a bad brake light switch (if none of the brake lights illuminate) but if its only one of the brake lights, try changing the bulb. Even if they still work as running or turn lights because they have a double filament and may still work partially, but not as brake lights.
What do you if the brake lights on your 96 Cherokee do not come on when pressing the pedal only the center window brake light and you don't have your owners manual and don't know which fuse to change?
I would check the bulbs in the tail lights first. Your Brake switch is working ,because of the third brake light is coming on.Ususally all the brake lights are on the same fuse.... Thanks DomAnswerCenter window light is on a separate circuit. Manufacturers did that so you don't lose all the brake lights at once. Check connections at brake switch and fuses. If ok look for broken wire in harness...............good luck, Mike
What is the problem if you have tail lights but only one brake light?
The tail light/brake light bulb has two filaments. If one of the filaments is broken, you will get either only tail lights, or brake lights. If a new bulb doesn't work, then you have a broken wire or bad connection in your plug-in.
Brake lights no longer working on 99 Jetta GLS Fuses are good as are bulbs Only brake lights affected any thoughts?
try adjusting switch above brake pedal
What is wrong when tail lights work on a 1995 Nissan pickup but the brake lights don't work?
Its the brake switch on the brake pedal. Its a plunger like switch, its usually the only thing on the brake pedal. Its pretty easy and cheap to change.
Does the light across the back of a Cadillac CTS lights up?
yes, it lights up only when brake is applied
