Bill,
It should be like the other Fords from that era to present. The light switch is incorporated into the door latch mechanism. There is not a pin switch in the door jam like the older Fords. I would spray some electrical cleaner into latch area, and maybe something like WD-40 since it is "more friendly" to the plastics in there.
I've had the same issue a couple of times on my Excursion. It is the back hatch that doing it. The Ex has 2 lower barn doors, and an upper lift gate for the glass. The lights are triggered by one of the latches in the liftgate. Occasionally when I shut the back, the lights stay on. A quick shot of WD-40 usually takes care of it.