It turned out to be the tailgate door on my 1998 Windstar. It has two
swithes, one in each door latch mechanism. Clean the latch mechanism with
contact cleaner and relubed with a light oil (triflow). Pat
Help with the dreaded "Door Ajar Light.." The common fix on this NG
has been WD40. I did not have any WD40 on hand, and on a whim reached for a
can of electronics parts cleaner..(CRC QD Electronics Parts Cleaner to be
specific...) Sprayed some into the door latch.
It worked instantly, on the first application. You can use a light
application on WD40 to lube the lock/latch afterward.
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