Open the engine compartment and inspect the main power distribution unit near the battery to identify circuits linked to starting, cooling fans, and fuel delivery before removing any component.
Main panel location: mounted close to the battery with a sealed plastic cover. Inside are high-amperage links rated from 30A to 60A and multiple relays controlling ignition, starter motor, and fan operation.
Inspection method: remove the cover and compare each slot with the printed layout on the underside. This helps match circuits such as fuel pump, PCM power, and radiator fan without disconnecting unrelated systems.
To check a faulty element, use a multimeter across both terminals; voltage present on only one side indicates a broken internal strip. For relays, swap with an identical unit from another circuit to confirm function.
Repeated failure in the same position often points to wiring damage, moisture intrusion, or excessive current draw from connected components, requiring inspection beyond simple replacement.
2002 Ford Explorer Under Hood Fuse Box Diagram with Relay and Circuit Details
Open the engine compartment panel near the battery and match each labeled slot on the cover with its assigned circuit before removing any component to avoid disconnecting the wrong system.
This power distribution unit contains high-amperage links and relays for ignition supply, fuel pump, cooling fans, and powertrain control module. Ratings typically range from 30A to 60A, clearly marked on each insert.
Relay positions are grouped together and control switching functions such as starter activation and fan cycling; swapping identical relay units can help confirm a faulty component without special tools.
If a specific slot repeatedly fails, inspect connected wiring harnesses, grounding points, and related components for damage or excess load rather than replacing the insert again.
Where the under hood fuse box is located in 2002 Ford Explorer and how to open it
Open the engine compartment and look near the battery on the driver side to find the main power distribution unit; it is a rectangular plastic housing with a tight-sealing cover.
This unit is mounted close to the fender and connected directly to the battery through heavy-gauge cables, making it easy to identify among other components.
- Positioned beside the battery
- Black plastic cover with locking tabs
- Thick wires leading into the housing
How to Open the Power Distribution Unit
Press the locking clips on both sides of the cover and lift upward evenly to avoid damaging the plastic hinges or tabs.
- Locate side latches
- Press or pull them outward
- Lift the cover straight up
Safe Access and Handling
Switch off ignition and remove the key before opening the unit to prevent electrical shorts or accidental relay activation.
After inspection or replacement, align the cover properly and press it down until all clips lock securely, keeping moisture and debris away from internal contacts.