This procedure covers removal and replacement of the engine bay fuse box (battery junction box) on a 2011-2014 Ford F-150 with the 5.0L Coyote V8 engine.

Warnings

Tools required

Parts

• Engine bay fuse box assembly × 1 — Use OEM specification
• Fuse box cover × 1 — If damaged during removal

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn ignition off and remove key from vehicle
3. Open hood and secure with prop rod
4. Disconnect negative battery terminal first, then positive terminal
5. Wait minimum 10 minutes for electrical systems to discharge
6. Take detailed photos of fuse box from multiple angles showing all connector positions
7. Label or photograph individual connectors if available to aid reassembly

Procedure

1. 1

   Remove fuse box cover
   Press the release tabs on both sides of the fuse box cover and lift upward to remove. The cover is secured by integrated clips. If cover is stuck, gently pry with trim tool at release tab locations. Note the positions of any fuses or relays if documenting current configuration.
2. 2

   Disconnect positive battery cable from fuse box
   Locate the large positive battery cable entering the top of the fuse box (typically red cable with protective boot). Remove the protective boot. Use a 13mm socket to loosen and remove the terminal bolt securing the positive cable to the fuse box. Carefully pull the cable terminal straight out and position away from fuse box.
   ⚠Even with battery disconnected, this terminal carries high current - ensure no contact with ground
   Torque spec

   Battery Terminal Bolts6 Nm (4 lb-ft)
3. 3

   Remove ground strap connections
   Locate ground strap connections on the fuse box mounting bracket. Use 10mm socket to remove ground strap bolts. Note the exact position and orientation of ground straps as these are critical for proper electrical operation. Keep bolts and washers together for reinstallation.
   ℹ️Ground connections must have clean metal-to-metal contact - inspect terminals for corrosion
   Torque spec

   Ground Strap Bolts12 Nm (9 lb-ft)
4. 4

   Disconnect main electrical connectors
   Working from the sides and rear of the fuse box, identify all large multi-pin connectors (typically 4-6 connectors depending on configuration). Each connector has a locking tab or slide lock. Press or slide the lock mechanism and carefully pull connectors straight out using even pressure on the connector body, not the wires. If connectors are stuck, gently rock side-to-side while pulling - do not force.
   ⚠Never pull on wires - always pull on connector body to prevent terminal damage
5. 5

   Disconnect auxiliary power distribution connectors
   Locate smaller connectors on the fuse box including any auxiliary power feeds, relay control connectors, and sensor connections. Press release tabs and disconnect each connector. Some connectors may have secondary locking tabs that must be lifted before the primary release will function.
6. 6

   Remove fuse box mounting bolts
   Using 10mm socket, remove the fuse box mounting bolts securing the assembly to the fender apron or inner fender structure. Typical installation uses 3-4 bolts. Support the fuse box with one hand while removing the final bolt to prevent dropping. Note any wiring harness clips attached to the mounting bracket.
   ℹ️Fuse box may be heavier than expected due to internal components - maintain secure grip
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
7. 7

   Remove wiring harness retaining clips
   Identify any wiring harness retaining clips or cable ties securing harnesses to the fuse box mounting bracket or nearby structure. Use trim tools or carefully cut cable ties to free the harness. Note positions of clips for reinstallation to prevent harness chafing.
8. 8

   Remove fuse box assembly from vehicle
   Carefully maneuver the fuse box assembly upward and out of the engine bay. Work slowly and check for any remaining connected wires or clips. The assembly may need to be tilted or rotated to clear surrounding components. Once free, place on clean work surface and perform final verification that all connectors are documented.
9. 9

   Inspect mounting area and clean connections
   With fuse box removed, inspect the mounting bracket for damage or corrosion. Clean ground connection points with wire brush or sandpaper to ensure bare metal contact. Spray electrical contact cleaner on connector pins in the wiring harness if corrosion is visible. Allow to dry completely before proceeding.
10. 10

    Position new fuse box assembly
    Position the replacement fuse box assembly into the mounting location. Align mounting holes with bracket. If reusing original fuse box, ensure it is oriented correctly using reference photos. Do not fully tighten mounting bolts yet to allow adjustment for connector alignment.
11. 11

    Reconnect all electrical connectors
    Using reference photos, reconnect all electrical connectors to the fuse box in reverse order of removal. Each connector should seat fully with an audible click and locking tab should engage. Verify each connection by gently pulling on connector body - it should not separate. Apply light coat of dielectric grease to weather-exposed connectors.
    ⚠Misaligned pins will cause connector to appear seated but not make electrical contact - ensure straight insertion
12. 12

    Secure fuse box mounting bolts
    Once all connectors are attached and verified, torque the fuse box mounting bolts to specification using cross-pattern tightening sequence. Verify fuse box is firmly mounted without movement. Reinstall any wiring harness clips removed during disassembly.
    Torque spec

    Module Mounting Bolts8 Nm (6 lb-ft)
13. 13

    Reconnect ground straps
    Attach ground straps to their original positions on the fuse box or mounting bracket. Ensure mating surfaces are clean and free of paint or corrosion. Install ground strap bolts and torque to specification. Ground connections are critical for proper electrical system operation.
    ℹ️Poor ground connections cause numerous electrical problems including no-start conditions and sensor faults
    Torque spec

    Ground Strap Bolts12 Nm (9 lb-ft)
14. 14

    Reconnect positive battery cable to fuse box
    Position positive battery cable terminal onto fuse box stud. Install terminal bolt and torque to specification. Over-tightening can crack the fuse box housing. Reinstall protective boot over terminal. Verify terminal has no movement after tightening.
    ⚠Terminal bolts are CRITICAL torque specification - over-tightening damages housing, under-tightening causes resistance and heat
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)
15. 15

    Reinstall fuse box cover and reconnect battery
    Verify all fuses and relays are properly seated in fuse box. Align cover with fuse box and press down firmly until all clips engage. Reconnect battery terminals (positive first, then negative) and torque battery terminal bolts to specification. Do not over-tighten battery terminals.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

    Cover Screws14 Nm (10 lb-ft)

Reassembly

1. Verify all electrical connectors are fully seated and locked
2. Check that no tools or parts are left in engine bay
3. Ensure all wiring harnesses are properly routed and secured with clips
4. Verify ground connections are tight and making clean contact

Verification

• Turn ignition to ON position (do not start) and verify instrument cluster lights illuminate normally
• Check for any warning lights or fault messages on instrument cluster
• Start engine and verify it runs normally without hesitation
• Test all electrical accessories: lights, horn, wipers, power windows, HVAC blower
• Use OBD-II scanner to check for any stored fault codes related to electrical system
• Verify fuel pump primes when ignition is turned on (listen for pump sound from rear)
• Test 4WD engagement if equipped to verify transfer case module communication
• Road test vehicle and verify all systems function normally under driving conditions
• After test drive, check fuse box area for any signs of heat, burning smell, or loose connections

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