I have an 06 F-150 Lariat with a 5.4L engine.

First of all, I was towing an unloaded towmaster a decent distance about 800 miles. About a quarter of the way the flat four pin connector came out going down the highway. I plugged them back in and everything worked fine on the trailer and truck, except for the drivers side LED turn signal on the mirror. Was told at the dealership that it was the bulb. So I decided to just purchase new towing mirrors both drivers side and passenger side. The problem still exists in the same fashion. Drivers side LED turn signal on the mirror still does not work.

I'm hoping someone can help me out with this issue.

Also the wiring harness for the trailer pin has always been a little lose and some wiggling was always needed to get the trailer lights to work properly.

 

Does anyone have any thoughts?

 

Check fuses. Did mirror signal work before you plugged in the trailer? Also, what are your doing with the second set of turn signal mirrors? Let me know if you are selling them..

 

Yes the turn signal did work on the mirror. Once the trailer connector fell lose it stopped working. I still have them, willing to sell if your interested. All the other lights are flashing when I actuate the drivers side turn signal just not the mirror turn signal. I did check the fuses and they are all ok.

 

Do the LED turn signal mirrors have their own fuse separate from the power mirror fuse?

 

no. Are the mirrors from Ford?

 

The original mirrors are, the new ones are OEM, the passenger side LED turn signal on the mirror works just not the driver's side.

 

Not just the regular turn signals work on the drivers side, even the power adjust is working and heated mirrors are working. Just not the LED blinker on the mirror? Makes no sense to me.

 

Time to get out the multi meter. They are all separate circuits.

 

Do you know where I can get a wiring Diagram for this circuit or ciruits?

 

Thought I would update on the actual problem I had. Inside the door jam there is a cluster of 14 wires that move from the door to under the dash. from opening and closing of the door in varying conditions, it broke four wires inside that cluster. Spliced them back together and problem solved. Thanks for your help.