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So the 4wd isn't working? Which wiring diagrams would be most helpful?
What seems to be not engaging correctly?
There are two options on this year model of explorer. Ford is notorious for their half-year changes. If your explorer still has the white build date sticker on the driver door jamb can you tell me the month/year of manufacture on there?
Ok, so that's early build. The most common problem on that model is the 4wd control unit. Is yours automatic or manual transmission?
Are you getting a good ground at the transfer case?