1994 Ford Explorer starter

Is the battery good? Also, one of the most common causes of what you described is a bad connection at the battery. Remove the battery terminals and clean and tighten them to make sure you have a good connection. Also, have you checked the starter relay? If you have a helper turn the key to the start position, check for power to the smaller wire in the starter. It should have 12+ volts.

Let me know.
Joe