Interior lights won't come on when the door is open on my 2003 Ford Windstar?

I just bought a 2003 Ford Windstar, and the interior lights don't turn on when a door is opened. If we turn the switch all the way up, all the lights come on, but don't ever turn off. It's not associated with a door being open. Anyone aware of how to fix this?

We were not aware of it until you told us.

The switch is no good. It may be part of the latch assembly, or it may have a regular plunger type switch.

Sounds like the switch at the door is in need of replacing.

Which door