Have 03 mustang brake light switch went out 3 times within a short time of each other, they replaced it at no charge each time but why does it go out so frequently, as a matter fact it went out again today

Thanks for the update! This could help others on here!

I would pull the rear brake light bulbs and top 3rd brake light wire first to check for a shorted bulb.Do you have trailer wiring?That can be a source of shorts too.Next would be a "short tester" be used on the brake light wiring.

Light gets power from brake light switch/.May be switch got shorted an brake light getting non-stop power causing it not to turn OFF brake light.

Get the brake light switch checked. Check volt at brake light switch.

It can be faulty brake light switch causing the problem or its wiring short for switch.

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To trouble shoot brake related problem, check the help links mentioned below:-----

Click the link:----

1996 Buick Regal Grand Sport Brake light Switch Location?

http://schematicsdiagram.blogspot.in/2012/04/1996-buick-regal-gran-sport-brake-light.html

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http://schematicsdiagram.blogspot.in/2012/04/no-brake-lights-on-buick.html

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http://schematicsdiagram.blogspot.in/2012/04/brake-lights-not-working-on-1989-buick.html

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How to replace Brake light switch on Chevrolet Tahoe?

http://technoanswers.blogspot.in/2012/02/how-to-replace-brake-light-switch-on.html

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How to replace Parking, turn, and Brake Lights on car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-parking-turn-and-brake.html

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Upper brake lights work, but low brake light not working?

http://schematicsdiagram.blogspot.com/2011/12/upper-brake-lights-workbut-low.html

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1997 Cadillac Catera: How to replace Brake Light Switch?

http://howtobyme.blogspot.in/2012/06/1997-cadillac-catera-how-to-replace.html

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1996 Chrysler LHS brake light circuit wiring diagram?

http://technoanswers.blogspot.in/2012/02/1996-chrysler-lhs-brake-light-circuit.html

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How to replace rear Brake lights on 2004 Toyota RAV4?

http://schematicsdiagram.blogspot.in/2012/02/how-to-replace-rear-brake-lights-on.html

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One brake light on driver side not working, but other lights work?

http://schematicsdiagram.blogspot.com/2011/12/one-brake-light-on-driver-side-not.html

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2002 Lincoln Town car Fuse Box

http://schematicsdiagram.blogspot.com/2012/11/2002-lincoln-town-car-fuse-box.html

2007 KIA Rio: Brake Light Fuse Box Diagram?

http://repairhelpcenter.blogspot.in/2012/06/2007-kia-rio-brake-light-fuse-box.html

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Overhead Brake lights not working on 1999 GMC Sierra 4x4?

http://technoanswers.blogspot.in/2012/03/overhead-brake-lights-not-working-on.html

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Brake lights not working

http://schematicsdiagram.blogspot.com/2012/11/brake-lights-not-working.html

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2004 Ford Mustang: Brake light Fuse Location?

http://howtobyme.blogspot.in/2012/05/2004-ford-mustang-brake-light-fuse.html

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These will help.

Thanks.

This problem, without a complete diagnosis of the vehicle, may be indicating a problem with the brake pedal position switch, which is located on top of the brake pedal. When actuated (or on), the switch will draw power from the system and leave the brake lights on. It is entirely possible that the vehicle had been driving with the brake lights constantly on. It is also possible, and I have seen this happen, that the switch develops a short and draws constant power while at the same time leaving the brake lights out completely. It is often evidenced by melted wires at the connection to the switch. Then again, any other item can be causing parasitic current draw.

In order to rule out other issues, a complete charging system test is needed. It could be just as likely that the system is so low on battery voltage and any noise under the dash is a motor or actuator drawing a small amount of power trying to start. Pushing the brake pedal closes a large circuit, which can drain the remaining power and stop the actuator or motor in question.

-Ed
ASE Certified Master Technician since 1984 - Everything from toy cars to the largest of trucks
Consultant for the North Carolina Consumers Council
http://www.NCconsumer.org

There is a switch under the dash for the Brakes. If this is the part they are replacing it can be due to physical damage caused by shoes hitting it. If you can check the repair bill find out if the switch is broken or burned out each time it was replaced.

If the switch is burning up, you need to trace the Brake wiring to the 3 fixtures. The high fixture and both taillights. Your problem would be bad light sockets or a bad wire to the brake. You are just operating about 3 lightbulbs, which at best is maybe 3 Amps. But if the power is grounding through a bad wire or bad socket, it will draw as much as it takes to melt the connection.

Don't know how important it is to you to know if your feet or someone else's feet are hitting the underdash switches. You could put ATV blue on the switch and it would rub off on the shoes hitting the switch. But it could make a mess on a carpet or start a War.

I hope you find my solution very helpful.

Remove your trunk liner and remove the tail lights to replace bulbs. Very simple to do.... just takes time.

9 times out of 10 its the brake switch located under the drivers side dash behind the brake peddle arm. However check the brake light fuses first.

in the trunk there is a control module for the lights they are none to go bad

go see the service manager again and tell him you want to speak to the area rep and to elevate the issue to them. keep notes

To shift from "P" to "R", there is a swicth that allows the shift button on the shift lever to be depressed. For this switch to work, the ingnition switch must be "ON" and the brake pedal depressed. If all yor brake lights went out (or if your brake switch on the pedal fails to work), then the shift switch wont work and you can not shift out of "P".