Okay, so I’ve been researching this for a few days now but I can’t seem to figure it out. I’m no mechanic nor am I an electrician lol. So I just purchased a 2012 ford F150 5.0 V8 4x4. My driver side blinker does not work in the rear nor does my brake light nor does the reverse light. I replaced ALL the bulbs, traced all the wires and made sure the grounds were connected. Here’s the part that I haven’t seen on any of the posts that I researched prior to creating an account.

When I unlock my truck using the key fob thingy my front blinkers blink, my mirrors blink, and the right side blinks. But the front blinker light on the left side stays dimmly lit for about 20-30 seconds before it turns off and when it turns off I hear a click! I hope this makes sense!

 

Sounds like the problem is in the BCM...

 

That’s what I was afraid of!