2011 F150 3.5L. When I crank the truck, front window operation varies. Sometimes both work, sometimes neither work, sometimes either driver or passenger work but not the other. If I shut the truck off and re-start, the symptoms change. Any ideas??? Power level (weak battery)??? Driving me nuts......

 

I had this happening last year until I replaced #49 relay front passenger foot well. Cheap and easy to try.

https://www.startmycar.com/ca/ford/f...o/fusebox/2011