third brake light, dome light, door unlock not working. - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 03-12-2018, 05:35 PM Thread Starter
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third brake light, dome light, door unlock not working.

So i am having trouble with my 3rd brake light and torque converter lock up. Ive checked the fuses and they look good. Ive checked to see if the third brake light is even getting power and its not and the wires seem to look fine. Really at a loss as to what i should check next. Any input would be greatly appreciated. Sucks driving the truck since the torque converter isnt locking up properly.
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post #2 of 7 (permalink) Old 03-12-2018, 07:23 PM
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Re: third brake light, dome light, door unlock not working.

The wiring for all that runs along the drivers side under the sill plat and goes to a connector in the piller just behind the door and then runs up to the lights. I would start at the wiring just behind the door if its good then its up inside the piller or roof if not then pull the sill and follow them.back till u find the problem.

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post #3 of 7 (permalink) Old 03-12-2018, 08:02 PM
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Re: third brake light, dome light, door unlock not working.

If you fix the cab mounted brake light odds are your transmission problem will be over.

You just need to start tracing wires.

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post #4 of 7 (permalink) Old 03-13-2018, 08:26 PM Thread Starter
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Re: third brake light, dome light, door unlock not working.

thanks guys i will try tracing the wires this weekend.
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post #5 of 7 (permalink) Old 03-13-2018, 11:06 PM
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Re: third brake light, dome light, door unlock not working.

Have you removed the light fixture from the cab and inspected it? It's notorious for melting from the heat of the tungsten bulbs, esp. if you leave your door open for extended periods, or hold your foot on the brake for long periods. That could possibly take out both the brake light and dome light circuits.
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post #6 of 7 (permalink) Old 03-14-2018, 03:17 PM Thread Starter
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Re: third brake light, dome light, door unlock not working.

yea i took it out and it was melted. but i replaced it and its still not working. i tested the wires and they are not getting any power. the fuses are good also.
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post #7 of 7 (permalink) Old 03-14-2018, 06:46 PM
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Re: third brake light, dome light, door unlock not working.

Pull up the door sill, it's probably rusted in the channel, and cut a wire

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