To find the potential problem:
1. Consult your owner's manual: This is the best place to start. It should have a fuse box diagram showing the location of all fuses and what circuits they protect. Look for fuses related to the rear wiper, rear window defroster (often on the same circuit), or power windows (sometimes shared circuits).
2. Check both fuse boxes: The 1999 Explorer typically has two fuse boxes: one under the hood and one inside the vehicle, usually under the dashboard on the driver's side. Check both carefully.
3. Test the fuses: Don't just look for a blown fuse visually; use a test light or multimeter to confirm. A blown fuse will show no continuity.
4. If the fuses are fine: The problem could be the rear wiper switch itself, wiring harness damage (especially around the tailgate area where the wiring is flexible), or the rear wiper motor. This requires more advanced troubleshooting and likely a visit to a mechanic.
Important Note: Without the owner's manual, providing a specific fuse location is impossible. The fuse number and location vary depending on options and trim level. Always refer to your vehicle's owner's manual for the most accurate information.
