Greetings
Have just got my first F150 - 2001 Flareside 5.4 with only 73k miles
So first post is a question - where are the door sensors for interior lights? - they all come on when the passenger door is opened but nothing with the driver's door...?

 

The switch is part of the hinge assembly. The one with the roller (lower I think). Try giving it a little shot of WD-40. That may solve your issue

 

ya wd the doors and open and close them a bunch my lights used to always stay on when it was hot out