* Owner's Manual: The most reliable source is your vehicle's owner's manual. It should have a detailed fuse box diagram showing the location of each fuse and what circuit it protects.
* Inside the Fuse Box: There are typically two fuse boxes in a Ford Explorer Sport Trac. One is usually located under the hood, and another is often found inside the vehicle, perhaps under the dash. The inside fuse box cover *often* has a diagram printed on it.
* Online: You can search online for "2002 Ford Explorer Sport Trac fuse box diagram". Many websites, including Ford forums and automotive repair sites, may have diagrams available. Be sure to double-check that the diagram is specifically for a 2002 model year, as they can vary slightly between years.
* Repair Manual: A comprehensive repair manual for your vehicle (like those from Haynes or Chilton) will contain detailed diagrams and information about fuses and relays.
Remember to always disconnect the negative battery terminal before working with fuses or electrical components to prevent short circuits and potential damage.