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Old 12-28-2012, 04:17 PM
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Brake lights dim / tail lights not working

I just started having an issue with the tail lights on my 2006 F-250 today. The turn signals began flashing fast so I assumed that I have a bad bulb, but then sometimes they would flash at the normal speed. When I got home I investigated and found these symptoms:
Brake lights would start out working, but would go very dim shortly after the pedal is pressed.
When I use the turn signal both tail lights will flash (although they are also somewhat dim).
The tail lights do not work at all when the headlights are turned on.

I've read quite a few posts and found that many people have had problems with the flasher or the multifunction switch (or both), but none with my specific symptoms.

I've also found the recall #11c18, but my VIN does not qualify.

There is also this guy who seems to have the same issue, but no replies.
F 450 TAIL AND BRAKE LIGHTS NOT WORKING

Anyone experience this?

Don't know if it's relevant, but it's been cold (0-20 everyday) and icy here the past week or so.

Thanks for any help.

Last edited by T-Shafe; 01-17-2013 at 01:18 PM.
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Old 12-29-2012, 03:22 PM
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The problem turned out to be a bad ground. In case anyone else runs into this I found that if I would pull out one of the turn signal bulbs the remaining one would flash correctly, but they would both go dim if I put the other one back in.

Coming out of one of the wire looms near the trailer plug I did find a small green that wasn't connected to anything, but it didn't seem to make any difference if I grounded that wire, so I may have to check a wiring diagram to figure out what that wire is supposed to be.

After I got all the snow melted from underneath and removed the spare tire I unbolted the black ground wire from the drivers side frame rail, cleaned the bolt, frame, and terminal with a wire brush wheel on an electric drill. Once clean and re-attached everything in now working fine.
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