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Discussion Starter · #1 ·
I have an 07 3500. My rear brake lights and turn signals don't work but my 3rd brake light and front turn signals work. I check the fuses and all good. Anyone know why the rear brake & turn signals on rear of truck don't work? it's both the left and right brake/turn. Bulbs are good, fuses are good, etc.

1 thing is the when you use the turn signal either left or right it blinks/clicks really fast inside the cab. Don't think that relay would be the issue but I have checked every logical thing possible.

Any help would be great. :thumbsup

Thanks
Jeremiah
 

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sounds like the wiring harness under the bed may have a bad connection . i would crawl under and check the connections at each plug in connector . if it has come unplugged . the blinker will blink fast just like when a bulb burns out .
 
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