Fast blinker on dash but turn signals work! HELP!!!!
 

I have a 16 f150 with the factory LED headlights and tail lights. I just noticed that my left turn signal blinks fast on my dash but the outside turn signals are all blinking normally and they are all working front and rear? Has anyone ran into this issue before? Any help would be greatly appreciated!

check your third brake light, a bulb is probably burnt out in it.

Welcome. I had this happen on my 13, same scenario. Eventually the front left blinker bulb went out.

Thanks, I actually just figured out what it was. The left side tail light conversion harness has a bad resistor so I ordered a new harness.

how did you figure it out ?

What tail lights were you running where you needed a resistor?

Im having the same issue at the moment, mines a 2016 and its the left side and also LED's how'd you come to that conclusion?

Not sure about newer trucks, but my 14 has TWO blinker lights on each side. If one stops working and the other continues to work you will get the fast blinker. Unless you know you are supposed to have 2 turn signal lights on each side it is easy to miss. Once I figured that out just replaced both bulbs at the same time. They only came in a 2 pack at the parts store.

.

You can turn this off in forscan. I did it yesterday when I switched all my tail bulbs to LEDs