Hi, sometimes the simplest of things can become complicated by omiting the theory of how a circuit works, The brake light switch is merely a break in a live wire, some cars are constant live, and others rely on the ignition switch being turned to the on position for the supply to work. You mention you have checked the above have you checked you have 12 volts at the feed wire at the brake light switch, no voltage should be rectified by looking for a secendary fuse or break in the supply, if you have 12 volt supply at the switch,next with the switch disconnected, join together both wires this will allow you to eliminate the switch, if the brake lights illuminate then the switch would be considered faulty, if it does not light move your testing to the rear of the car, at the switch you will observe the colour of the wire feeding the rear brake lights, at the rear of the car observe the wire and check for 12 volts, if not present check for break in wire, sometimes the wire can become damaged in tailgate rubbers etc where amooving part may trap or fracture the wire, it is. Most likely that this is the problem when more than one light does not light , as the rear lights and indicators are working we can assume the earthing to the light is correct, hope this is of help to you paul
Turn signal tail lights and BRAKE LIGHTS NOT WORKING
It
can be faulty brake light switch causing the problem or its blown brake light bulb.
First check and confirm brake light lamp is working and that's not
the case.
For turn signal not working it can be faulty turn signal switch or its issue with wiring:----
==========
To
trouble shoot brake and turn signal 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
-----------
No brake lights on Buick?
http://schematicsdiagram.blogspot.in/2012/04/no-brake-lights-on-buick.html
----------
Brake lights not working on 1989 BUICK REGAL?
http://schematicsdiagram.blogspot.in/2012/04/brake-lights-not-working-on-1989-buick.html
-------
How to replace Brake light switch on Chevrolet Tahoe?
http://technoanswers.blogspot.in/2012/02/how-to-replace-brake-light-switch-on.html
---------------
How to
replace Parking, turn, and Brake Lights on car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-parking-turn-and-brake.html
----------
Upper brake lights work,
but low brake light not working?
http://schematicsdiagram.blogspot.com/2011/12/upper-brake-lights-workbut-low.html
------------
1997 Cadillac Catera: How
to replace Brake Light Switch?
http://howtobyme.blogspot.in/2012/06/1997-cadillac-catera-how-to-replace.html
------------
2003 Chevrolet S10 Tail light Fuse
http://schematicsdiagram.blogspot.com/2012/11/2003-chevrolet-s10-tail-light-fuse.html
---------
Chevrolet Parking light and Tail lamp light
Wiring diagram
http://schematicsdiagram.blogspot.com/2012/11/chevrolet-parking-light-and-tail-lamp.html
----------
Car Tail Lights Not Working?
http://schematicsdiagram.blogspot.com/2011/12/car-tail-lights-not-working.html
----------
Turn Signal Not working
http://technoanswers.blogspot.com/2012/11/turn-signal-not-working.html
----------
Right turn signal not working on Pontiac Car?
http://schematicsdiagram.blogspot.com/2011/12/right-turn-signal-not-working-on.html
--------
Only one side indicator light working on car?
http://schematicsdiagram.blogspot.com/2011/12/only-one-side-indicator-light-working.html
-----------
Turn signals not working on 1987 Jeep
Wagoneer?
http://schematicsdiagram.blogspot.com/2011/12/turn-signals-not-working-on-1987-jeep.html
1996 Chrysler LHS brake light circuit wiring
diagram?
http://technoanswers.blogspot.in/2012/02/1996-chrysler-lhs-brake-light-circuit.html
----------
How to replace rear Brake
lights on 2004 Toyota RAV4?
http://schematicsdiagram.blogspot.in/2012/02/how-to-replace-rear-brake-lights-on.html
------------
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
----------
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
-------------
Overhead Brake lights not working on 1999 GMC
Sierra 4x4?
http://technoanswers.blogspot.in/2012/03/overhead-brake-lights-not-working-on.html
---------
2004 Ford Mustang: Brake
light Fuse Location?
http://howtobyme.blogspot.in/2012/05/2004-ford-mustang-brake-light-fuse.html
---------
These
will help.
Thanks.
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