door ajar sensors(windstar)

i know this has been addressed before but i can't find the post, 96 windstar(what else of course),,the door ajar light stays lit in panel,the dome light stays on for awhile but will go off as long as car is in gear(doors will not automatically lock now) if i turn van off and close doors,dome lights stay burning,will not shut off,(i removed bulbs so battery will not drain.till i fix the problem)i suspect the rear door which has two sensors(on springs) on each side,i know there is a test i can do to determine which door it is? can somebody help and repost the solution again.thanks for the backtrack and atteintion again. bob