The fuse number for the windshield wipers on a 1997 Ford F-150 isn't a single, universally applicable number. It depends on which specific fuse box you're looking at (there's usually one under the hood and one inside the cab) and even then, it might be controlled by a relay.
To find the correct fuse, you absolutely MUST consult your owner's manual. The manual will have a diagram showing the location of all fuses and what each one controls. Looking at the diagram will save you a lot of time and frustration compared to guessing.
