Question about 2004 Mercury Mountaineer

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BRAKE LIGHTS GO ON AND OFF ON THEIR OWN--NO KEYS OR NO ONE IN THE CAR. MECHANIC SAYS THERE IS A DEFECT IN THE BRAKE LIGHT SWITCH AND IT HAS BEEN REDESIGNED. DOES ANYONE KNOW ABOUT THIS AND CAN I GET REIMBURSED FROM FORD?

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Mechanic could be right have your abs sensors checked . when car is running is the check engine light on? If so have it scanned and see what codes are there

Posted on Mar 11, 2011

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Lumina troubleshooting


Check fuse.
Check if center light works.
Check for power at light sockets.
Check brake light switch.
Manipulate the turn signal lever.


- To check the brake light fuse, open the passenger door and remove the fuse panel cover that is located around the corner from the glove compartment. On the back side of the fuse panel cover there should be a fuse location chart. The brake light fuse is #23, located in the socket that is dead-center among the mini fuses. I believe it is supposed to be a 15A fuse. Confirm the condition of the brake light fuse and replace if necessary. If the fuse fails again, determine and correct the cause.
- Also, see if the center brake light is working properly. If it is, then the brake light switch is working. If the center light is not working, the brake light switch is suspect. That switch is a spring-loaded plunger switch that is of the "normally closed" variety. In this application the switch is usually held open by the brake pedal arm, except when he pedal is depressed. Then the spring within the switch holds the contacts closed so that the brake lights will operate.
That switch is located under the instrument panel. Look for a push-button switch that is contacting the brake pedal lever. If the car has cruise control there will be two switches, one above the other. I believe that the lower of the two is the brake light switch.
- With the brake pedal depressed, see if you have power and ground at the brake light sockets. One good way to confirm that is to remove a brake light bulb and connect a 12v. test light across the contacts in the socket.
- An operating center brake light combined with no power to the 12v+ terminals at the left and right brake light sockets could indicate a defect within the turn signal switch. If you get to the point where you suspect a defect there, try applying rearward pressure on the turn signal lever and see if the brake lights work then. If that procedure confirms that the defect is within the turn signal switch, you can replace the turn signal switch. Or you could try my trick which cost me less than a dollar and has worked for years.
See attached photo.

Spacer (piece of rubber tubing?) is used to apply rearward pressure on turn signal lever. I have not disassembled the switch assembly, but evidence suggests that electrical contacts inside the switch depend on the mechanism being positioned properly. If the internal positioning device failed (perhaps the lever was pushed forward) then an external device can be made to hold the lever and switches in proper location.
If you attempt this repair, consider applying some lubricant as deemed necessary.
Good luck.

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Aug 30, 2014 | 1998 Chevrolet Lumina

1 Answer

No brake lights/tail lights. replaced light switch. if the brake switch knob is pulled out slightly, they work but i loose the main headlights. checked all the fuses they are good


Low battery voltage (headlamp relay cuts out).Start the car,measure charge,let charge.Wiring shortcircuit must track the problem/wires.Hint:the brake switch trigger only with the keys on.If it continue to cut the light even with the keys out ceck wiring .Worning:shortcircuit can put a car on fire.

Oct 26, 2013 | 1994 Ford Ranger Supercab

2 Answers

Brake light on 2000 ford windstar doesn't work


bad earth the wire that goes to the car body could be lose

Apr 16, 2013 | Ford Cars & Trucks

2 Answers

MY 1997 MAZDA PROTEGE BRAKE LIGHTS STAY ON AFTER THE VEHICLE IS OFF AND KEYS ARE OUT OF THE IGNITION. I TRIED ALL THE FUSES AND CANT FIGURE OUT WHY THEY ARE STILL ON?


You may have a stuck brake light switch. The brake light switch is by the pedal and when the brakes aren't applied there should be power going in but not coming out. If you got power coming out replace the switch.

Jan 27, 2013 | Mazda Protege Cars & Trucks

1 Answer

One brake light not working


didnt specify vehicle -- generic answer -- recheck bulb new doesnt mean free from defect also check the socket --the light that lights up can be the tail lights some vehicles have one bulb but has 2 filiments [brake tail ]

Jul 12, 2017 | 2005 Nissan Sentra

2 Answers

2005 Ford Focus- Blinkers, Brake lights and hazards don't work -just change the bulbs and they still don't work. Help!


That should be on two different fuses, but everything goes thru the turn signal switch.
The switch might be faulty. A mechanic would check for voltage there.

Jul 11, 2012 | Ford Focus Cars & Trucks

1 Answer

2003 Cadillac CTS - the car won't shift from park if you start it and don't have your foot on the brake. Also, the traction control warning light is always on, and the over-hood brake light works, but the...


sounds like you have a bad brkae light switch, which is located on the brake pedal assembly. a bad switch will not let you shift out of park and you will not have any brake lights as the car does not recognize that the pedal is being pushed and brakes engaged. easy to replace switch if you are handy, if not this is a inexpensive repair at any mechanic. hope this was helpful is so please rate 4 thumbs.

Jan 12, 2011 | 2003 Cadillac CTS

1 Answer

Brake lights


THIS IS CAUSED BY A DEFECT IN THE INTERNAL CONNECTIONS OF THE TURN SIGNAL SWITCH

Mar 24, 2009 | 1992 Cadillac Seville

1 Answer

Brake lights on when car is off


bad brake light switch or wire off switch both will cruise not to work

Oct 22, 2008 | 2003 Mercury Sable

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