* Under the hood: This is the main fuse box and contains fuses and relays for most of the vehicle's electrical systems.
* Inside the passenger compartment (often under the dash): This usually contains fuses for interior accessories and convenience items.
To find the specific fuse or relay for a particular circuit, you'll need to consult your owner's manual. The manual will have a diagram showing the fuse box layout and what each fuse protects. If you don't have your owner's manual, you can often find a downloadable PDF version online through Ford's website or a reputable automotive parts website.
Without knowing what electrical component you're trying to troubleshoot, it's impossible to give more specific information. If you're experiencing an electrical problem, checking the fuses and relays in both boxes is a good starting point.