Hi everyone,

I have a 2006 Big Horn Quad Cab. I have an issue where when the brake pedal is pressed and the left blinker is on, it blinks really fast, and the back upper and lower tail lights blink back and forth in sequence. It stops blinking fast and blinks normal when the brake pedal is not pressed.

I've checked everything and can't seem to figure this out. Any ideas? The only thing I know is that something is possibly grounding out on something, but where?

Thanks.

 

This is going to sound obvious, but have you tried changing the rear bulb? It may appear to be working but might be a broken filament... Otherwise I would check for a problem with the socket itself, or the wiring harness. Is the truck still under warranty? If so, let the dealer figure it out.