4x4 switch does not operate on 1993 Ford Ranger

checked fuse ok i don't think its getting power

2 answers
Your Ranger has a transfer case motor that the switch operates when selected ( cardone industries #48-206 ) better off having a tech diagnose this before replacing parts.
i had the same problem, my wire harness attached to differential had some crimped wires, moved them around until it worked, temporary fix