Question about 1999 Ford Super Duty F 450

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No brake lights but fuse is good. Wiring appears okay.

No brake lights on a 1987(?) Ford F-800 dump truck but the fuse is good, also proper voltage on both sides of fuse. Wiring appears to be good back to front (engine area and fuse panel). I suspect the pressure switch on brake peddle but I need a wiring diagram to assist in troubleshooting.

I'm a volunteer at the National Park Service working this problem.

Thanks

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Isnt there a switch on the brake pedal inside under the dash? There should be power going in and out when depressing the brake pedal. If there is a pressure switch, then check it when the brake pedal is up and then depressed. it should have power on one side up, and both when depressed. One thing to keep in mind that I think it goes through the turn signal switch, so if blinkers work, that tells you the wiring is good to the lights, so concentrate on power getting to and out of the turn signal switch.

Posted on May 12, 2010

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Hello! +12 volts is supplied by fuse #1 (15A)...It is wired to one side of the brake switch (Light Green/Red)...other side of switch applies the +12 volts on Light Green wire to multi function switch (turn signals, parking lights)...etc...The left brake light is Light Green/Orange...The right brake light is Orange/Light Blue Brown...Other side of brake lights go to ground Brown wire...

I also would suspect the brake switch...Easily tested..+ side of volt meter to the Light Green...other to ground...Have someone press the brake pedal...Should read +12 volts...If you do; Follow the +12 until you lose it ( not you, the 12 volts...little humor )...A Truck that old usually suffers from loss of ground or resistive ground...

Guru..............saailer

Posted on May 12, 2010

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