Turn signals work but no brake lights? - Diesel Forum - TheDieselStop.com
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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 02-07-2006, 06:16 AM   #1 (permalink)
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Turn signals work but no brake lights?

Basically the subject sums it up. Turn signals work but not brake lights? I thought that if you have turn sigs then the brakes work and vice versa? Aren't they tied in?

Thanks in advance for any and all responses.

Esson
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Old 02-07-2006, 09:17 AM   #2 (permalink)
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Re: Turn signals work but no brake lights?

I didn't think this was possible either, but i just had the same trouble and put in a new brake switch. Fixed the problem.
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Old 02-07-2006, 10:37 AM   #3 (permalink)
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Re: Turn signals work but no brake lights?

If you have a tilt steering wheel it may be in the column. Tilt the steering wheel all of the way down & see if the brake lights work. If they don't work, tilt the column all of the way up and check it again. On mine it ended up being a connection in the column to the multi-function switch. When the wheel was in the 'bus driver' position the brake lights worked, when the wheel was in the down position the brake lights did not work. The turn signals worked regardless.
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Old 02-07-2006, 11:58 AM   #4 (permalink)
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Re: Turn signals work but no brake lights?

Brake lights are powered by the brake light switch on the brake pedal arm.
The voltage from the BLS is routed through the turn signal switch, then to the brake/turn lights.
When you activate the turn signal switch, it breaks the brake light circuit to the selected circuit (right/left) and completes the turn signal circuit.

So you could have a defective brake light switch or a defective multi-switch(turn signal switch.
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Old 02-08-2006, 03:45 AM   #5 (permalink)
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Re: Turn signals work but no brake lights?

Mark and LWC, thanks a million! I'll have a look-see at the steering column up-down in the morning as yes I do have a tilt wheel.

LWC, where is the brake switch located at?

I think I have a bad master cylinder as when I'm sitting at a light/sign my pedal seeps downward and sometimes I have to really apply extra pressure when stopping, also my brake light comes on. Have new brakes all the way around and my booster is pulling 16" of vacuum.

Esson
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2000, F350 Lariat, CC, Blue, At 110k miles (Oct 09) TRC Auto Trans, 4x4, Tymar Intake, Banks EGT, Tranny Temp and Boost A pillar gauges. Banks chipped, and exhausted. DIY LED Cab lights. 05 style Headlights. Marinco Mod

"When it's upsidedown and burning, you've gone too fast."
"Customer Service is an ATTITUDE!!...not a department!"
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