* Under the Hood: This is the primary fuse box and contains larger fuses and relays. It's usually located near the battery, but the exact location might vary slightly depending on the engine and options. Look for a large black plastic box.
* Inside the Passenger Compartment: This fuse panel is typically located under the dashboard, on the driver's side. You may need to pry open a small access panel (often a small cover). This panel usually houses smaller fuses for interior components.
To be certain: The best approach is to consult your 2001 Ford E-150 owner's manual. The manual will have diagrams showing the location of each fuse box and a legend identifying each fuse and relay. If you don't have the manual, you can often find a PDF version online through a Ford website or a reputable automotive repair manual provider.
