The early cars have a list of things that might cause the problem you describe. The shift motor on the transfer case can move slightly, enough to confuse the controller module. The controller module itself may have failed. You may have a blown fuse.
There is an extensive resource on the problems and solutions compiled at
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This site maintains an archiveof listserve and usenet posts on Expolorer issues dating back to theearly '90's You also have searchable access to early usenet postsfrom this group through Google's online service at google.com.Hope this helps!
dr bob '92 XLT 4x4 4D, black, still running fine at 200k miles.
k>i have a 1992 explorer and the for wheel drive does not work. it has
the buttone on the dash and they do not push and no lights come on any
>one that knows about this please let me know
>--
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