More than likely this is a mirror issue because according to the factory wiring diagram the switch is the only thing that controls these.
Were these factory power mirrors that were installed or were they from some other supplier? In other words are they Ford parts or did you get them from somewhere else?
Also, did they provide installation instructions and did you have to rewire anything?
Please see the info below on the wiring diagram but as I said this is most likely a mirror issue. However, if this was a factory part then it could be a switch issue and we need to check the voltage at the mirror with the truck running to see if we have any voltage there that could cause this.
Lastly does it always move to the same position on it own or is it random?
Take a look at this info and let us know about this and we can go from there.
Images (Click to enlarge)
Monday, April 19th, 2021 AT 4:56 PM