To find it:
1. Locate the underhood fuse box: This is usually a black plastic box located near the battery.
2. Open the fuse box cover: You'll likely need to release a latch or clip.
3. Consult the fuse box diagram: The inside cover of the fuse box should have a diagram showing the location and amperage of each fuse. Look for fuses labeled "Power Windows," "Window Switch," or something similar. The diagram will use numbers or symbols to identify the fuse's location.
If you can't find it using the diagram, it's best to consult your 1999 Ford Ranger's owner's manual. This will provide the most accurate and detailed information for your specific vehicle. You can often find a PDF version online if you don't have a physical copy.