Ford Expedition 2007 - dome light/third brake light not working, crazy wiring

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FuelConsumer

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Jun 23, 2025
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Hello guys,
I just registered myself - I have been using this forum for quite a while now and it was really helpful.
But right now I´m stuck with a small problem: My third brake lights are not working at all. I cleaned it today, replaced 5 burned out light bulbs but nothing worked and there is no voltage at the socket itself.
After taking out the rubber to check the cables I saw that there is a not connected blue wire which, I thought, was connected to the yellow/grey (brake light) wire. The blue wire was weathered and got lose because of bad soldering I guess. I put some tape on it for the moment.

After connecting the blue one to yellow/grey my rear brake lights were all on including the third brake light. I waited 10 minutes because I thought it´s some kind of homecoming-function but nope, all lights were still on and I had to disconnect the blue wire to stop that.

Any idea where my problem could be or does anyone have a wiring diagram for this specific part of the brake lights?

My turn signals are really fast, the same speed you got when a bulb is gone...but they are all working. I doubt it´s related with this issue but I thought I would let you know.
 

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