Question about 2005 Mercury Grand Marquis

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Both brake lights and 3rd light in back window fail to light when brake is applied. tail lights do work when headlights are on.

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It can be a few problems but i would start by checking the fuses. after that look under the dash where the brake pedal is. you will see a switch there that toggles on when you apply the brakes. i have to mention one other thing because i've had experience with it. check to make sure the bulbs are good. unless your car is equipped with a warning system or you check the brake lights often they may all be burned out over a period of time without you knowing it. a small trick to that is whenever you are backing up or near a something that you can see the back of your vehicle... apply the brakes... if you don't see lights on one or both sides it's time to start changing bulbs.
the tail lights working is independent of the brake lights as generally if it's the same bulb it will have two filiments.

Posted on Apr 24, 2010

  • Dag35funk Sep 21, 2011

    Could this be caused by the light control module ??

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Brake Light Problem


Hi,

Often brake lights and signal lights not working indicates a loose grounding of the rear electrical assembly. Other indicators would be dim and/or all the lights light up (but dimly) when engaging the breaks or activating any of the turn indicators. A way to verify this is to hardwire another/external grounding wire to any of the metal receptacles of the bulbs straight to a bare metal/chassis of the vehicle.

Of course the standard procedure of checking the fuses, the harness connectors and the wire harness themselves still apply.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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