Question about 2002 Mercury Mountaineer

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My brake lights are not working, bulbs are new and fuse is good. what could be the problem

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Brake light switch may need adjusting or it may be defective. Check the brake light switch.

Posted on May 07, 2010

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2004 Trailblazer lower taillights not working upper work fine.


With the condition of the screws you should check to make sure there is a good connection to the lower bulbs for both power and ground.

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I have a 2000 grand Cherokee Laredo v8 all my brake lights went out checked the bulbs fuse and brake switch all are good the tail and signal lights are good. what should I do nextto fix the problem


Have you checked the brake light fuse to see if there is power at the fuse and out of the fuse, also check the brake light switch for power in and out when the pedal is pressed, do that and get back to me.?

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My driver side brake light went out but the tale light still works bulb is new


Hi Jimmy.

Most every circuit in a car goes through a fuse. if you look in your owners manual for the particular vehicle you drive, you should find a listing for a fuse for brake light or brake lights. The tail light being OK should not have anything to do with the brake light. They'll be different bulbs, or, at worst, different filaments in the same bulb, and on different fuses. The brake and tail lights are distinct because otherwise, if you had your tail lights on at night, no one could tell you were pressing your brakes.

If you were meaning that the bulb for the brake light in the tail cluster is good, that also will point to a blown fuse. Check there first.

Good Luck

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Dec 02, 2015 | Cars & Trucks

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My additional brake light is not working i have tested the brake unit and that works is there a seperate fuse for this or is it all on one fuse for all the brake lights


The third or High Mounted Brake Light runs straight off the brake light switch on the brake pedal arm. You say you tested the "brake unit"? I assume you mean the third brake light assembly, and if you get power there when someone steps on the brake pedal, then the bulbs are bad.

The power flow for the brake lights goes like this: Fuse ->Brake switch -> Turn signal switch -> Rear lights. The only difference is, if you have a 3rd brake light in your rear window, that gets its power directly from the brake switch. It does not go thru the signal switch first. So, if you are having a brake light problem, and your fuses are good, check the 3rd light in the rear window, if it lights up (assuming the bulbs are good, no one ever changes them), then the problem is most likely in the turn signal switch, hope this helps!

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The 3rd/high brake light is not working .. replace light bulb with a new bulb. nothing happened. checked to see if fuse is good couldnt find it.. besides the fuse what could be the problem.. 2001 gmc...


Brake light switch. If I remember correctly, the third brake light works off a seperate circuit from the other brake lights so part of the switch could be bad.

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Right brake light does not work when press the pedal but all 3 bulbs light up when locking or unlocking car so to me bulbs are good is this a fuse?


If it were a fuse issue, neither brake light would work.

The alarm may be connected to running lights and not the brake light, I'd simply swap bulbs lft to right, if the problem follows, new bulbs before worrying about chasing wiring problems.

Hope this helps.

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1999 GMC Envoy: replaced both GE 3057 lamps in left rear light assembly. Lamps both light. However depressing brake pedal does not initiate brake light. The righ rear brake light does work. The high mount...


The high mount brake light has its own fuse, so check that first. The high mount bulb is generally a stabdard type (there may be more than one bulb) or you can replace with an LED. As for the left rear bulbs not working when depressing brake pedal, check the bulbs again for any spring that may be broken. If the bulbs are still good, make sure there is sufficient contact with the socket. If still not working, have someone check it out further.

Feb 15, 2010 | 1999 GMC Jimmy

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The brake lights on my 1999 saturn sl do not work. The bar on the rear window functions. The bulbs and fuse is ok--what is the problem


does the third brake light work when braking ? the bar on the rear window? if not replace brake light switch on brake pedel

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1 Answer

Brake light will not work


check to make sure that you used the exact bulb part number that came out. each bulb has a different resistance.

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