To find it, you need to:
1. Consult your owner's manual: This is the most reliable source. The manual will specifically show you the fuse box diagrams and locations for your year and model.
2. Check the under-hood fuse box: Many Ford E-250s have the main fuse box under the hood, often near the battery. Look for a fuse box cover with a diagram showing the fuse locations and what each fuse controls.
3. Check the interior fuse box (if applicable): Some E-250s may have a secondary fuse box inside the passenger compartment, often located under the dash or in the center console. Again, check the cover for a diagram.
4. Look for labels: The fuse box covers usually have labels indicating which fuse controls which component. Look for labels mentioning "windshield wipers," "wiper motor," or similar.
Without knowing the year of your Ford E-250, it's impossible to give a precise location. Providing the year will allow for a more accurate answer.