Question about 2005 Mercury Grand Marquis

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I have no brake lights and the fuse looks okay and the fuse for the brake light switch looks okay, too. What next?

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  • 13 Answers

Most likely the wire to the brake light switch or the switch itself is bad. This is a very common problem for these vehicles.


Good luck
Doug from www.steeringcolumnservices.com

Posted on Jan 06, 2013

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Posted on Jan 02, 2017

  • 19 Answers

SOURCE: I am having a problem

If you have changed the brake lamp switch and it has made absolutely no difference on each occasion I would be checking the earthing connection to the rear lamp clusters.

Posted on Oct 04, 2008

michigan man
  • 3533 Answers

SOURCE: wont shift from park

have you try adjusting the linkage on the transmission and have you checked all of the grounds and and took an 12 volt tested and check out the light switch and there should be a silver box in the fuses box under the dash on the driverside test that also that could be the problem with your turn signal

Posted on Feb 08, 2009

Nemesis5791
  • 133 Answers

SOURCE: brake lights don't work. Bulbs, fuses and

Filaments on actual bulbs might be burned out, pull the socket out from the back of the tailights and do a visual check on the bulbs, replace if needed...

Posted on Aug 23, 2011

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1 Answer

Why would my 93 F-Series break lights not work, but the turn signals do?


First check brake bulbs. If they are okay check fuses, the fuses are probably on a different circuit to your indicators. If the fuses are okay then next check that the brake light switch is functional, it is attached to the top mounting point if the brake pedal probably. The fault is almost certainly one of these, there is not much else to go wrong

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2004 Tacoma - tail lights don't work but brake lights and reverse lights do work. Bulbs look ok. fuse looks okay. Wiring looks ok. Could it be a relay or is there something else to check? Than


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I have a 91 ford f150 and the brake lights wont work and the rear right blinker is dim. Can you help me?


Check System Fuse - A fuse is used to protect the brake light circuit from amperage overload. If the fuse has failed it will not allow the electrical current to continue to the brake lights. To check the fuse, first locate the brake light system fuse in the fuse panel which is either under the dash or under the hood in the power distribution center. Connect the test light to a ground like an engine or dash bracket and turn the ignition key to the "on" position. Using the test light probe both sides of the fuse. If the test light illuminates on both sides the fuse is okay continue onto the next step. If one side of the fuse illuminates the fuse has failed and needs to be replaced. If the fuse fails as soon as it is replaced or when you apply the brake pedal the brake light electrical circuit is shorted to ground. Rarely a system short can occur, a car repair manual is needed to find the wiring schematic for the brake light circuit. Once the brake light wiring has been located inspect and repair as needed.

Check Brake Light Bulbs - All cars have three brake light bulbs that create the brake light illumination affect. If all of these brake light bulbs fail no brake light operation will occur. I know what you're thinking, you might say all three brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove any of the brake light bulbs to confirm the bulb is okay or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are okay continue to the next step.

Checking the Brake Light Switch - A control switch is used to connect the brake light electrical circuit. This switch is located near the brake pedal lever. Basic switches have just two wires, power in and power out to the turn signal switch. Use a test light that is grounded and with the key in the "on" position test for power at one side (wire) of the switch, then press the brake pedal while testing the opposite side (wire). It should illuminate the test light, if electrical power is connected through the switch go to the next step. If no power is detected through the switch the brake light switch has failed and replacement is required. If your car is equipped with more than two wires integrated into the brake light switch a car repair manual is needed to locate the proper brake light circuit wiring.

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1 Answer

What fuse is it for taillights and dome light 2000 ford focus


Running lights (left side): Fuse #47 -- Running lights (right side): Fuse #48 -- Brake lights: Fuse #54. Fuse panel is on the lower left side (underneath) the dashboard. NOTE: If it is your brake lights that are not working and fuse # 54 looks okay, check the brake light switch, it may have gone bad. Dome light is fuse #46 or #47 depending on model.

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4 Answers

1998 gmc sierra-no brake lights,bulbs ok,new brake switch,possible wiring?? Help


Try this possibilities to locate the fault. First get your voltmeter or 12v test lamp out. Check the 30 amp Brake (#2) maxi fuse in the under hood junction box.Fuse should have 12v at both sides at all times.
If okay proceed.
Go to the brake light switch. The orange wire should have 12v at all times. The white wire should have 12v when stepping on the brake.
If okay, proceed.
Next thing is the brake lamp relay in the underhood fuse box. Swap the relay with one that looks just like it and recheck the brake light operation. If the relay is no good replace it.
If the relay is swapped and still not working, see if you can feel the relay clicking when someone else steps on the brake pedal.

batt is power from the maxi fuse 12v all times
sls is the white wire from the brake switch 12v with brake applied.
gnd is body ground 0v all times
mfs goes to the multi function switch 12v with relay activated
the circuit is simple—power from the brake light switch white wires turns on the relay which then sends power back to the multifunction switch for distribution to the rear lights.
if you jump terminals batt and mfs the brake lights should come on.
If you have no power at terminal sls with the brake applied then you have a wiring fault white wire between the brake light switch and the relay
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Aug 17, 2010 | 1998 GMC Sierra

1 Answer

Car starts and runs fine. Wont shift out of park. Tried looking for vacuum line unsuccessfully. Shifter moves freely, but doesn't engage other gears or neutral.


CHECK BRAKE LIGHT SWITCH FUSE AND THE BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID FUSE.IF THEY BOTH CHECK OUT OKAY.YOU HAVE A FAULTY BRAKE LIGHT SWITCH OR FAULTY BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID.

Oct 04, 2009 | 2003 Pontiac Sunfire

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I have a 2001 Nissan Altima, brake lights not working. Fuses okay and brake switch okay. What else can I look for?


there is a plastic plug that push the brake swith and they usually brake after many years , check that , and also check all the light bolbs

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Check the brake light switch at the brake pedal, try and activate it by hand, if still no brake lights, would recommend replacing this switch. Hope this helps.

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1 Answer

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First thing I'd check would be the fuse for the stop lights. If it is okay the next thing I'd check would be the stoplight switch located under the dash where the brake pedal is suspended.

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