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-   -   turn signal lights up tail light (http://www.fordtruckfanatics.com/forum/showthread.php?t=41032)

skyrader 08-19-2017 11:47 AM

turn signal lights up tail light
 
weird problem is the rear turn signal crosses from turn/brake filament of bulb to the tail light filament. it's doing this on the left or right. when I turn on turn signal it crosses back n forth to the tail light. Anyone had or heard of this issue? where do I start to look? Do I have a short some where?

Fellro 08-19-2017 12:17 PM

Bad ground would be the first thing to check.

blacksnapon 08-19-2017 12:58 PM

or a bad bulb

Jasperrc 08-23-2017 07:08 AM

I've had all kinds of issues like that with bad grounds. Also had bad sockets cause issues like that.

I would start by checking grounds. I ended up adding numerous ground straps which cleared up some weirdness I was having.

Also check to be sure the wiring harness isn't pinched or damaged somewhere causing shorts.


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