This procedure covers the removal and replacement of the interior fuse box (junction box) located in the passenger compartment of the 2015-2020 Ford F-150 with the 5.0L Coyote V8 engine.

Warnings

Tools required

Parts

• Interior fuse box (if replacing) × 1 — Use OEM specification
• Trim panel clips (if broken) × 1 — Ford trim clips assortment
• Electrical contact cleaner × 1 — CRC 05103 or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition to OFF position and remove key
3. Open driver's door to maintain interior lighting during procedure
4. Disconnect negative battery terminal and secure cable away from battery post - wait 5 minutes minimum
5. Locate interior fuse box on the driver's side lower dash panel, left of steering column
6. Take clear photos of fuse box and all connected harnesses for reference during reassembly

Procedure

1. 1

   Remove lower dash trim panel
   Locate the lower dash trim panel below the steering column on the driver's side. Use trim panel removal tools to carefully pry out the panel starting from the bottom edge. Release the plastic retaining clips by pulling gently. There are approximately 6-8 clips holding this panel. Once clips are released, pull panel away from dash and set aside.
2. 2

   Access fuse box mounting area
   With the lower trim panel removed, the interior fuse box (junction box) will be visible mounted to the left side of the steering column support bracket. Use a flashlight to inspect the mounting bolts and connector locations. Identify all electrical connectors attached to the back and sides of the fuse box - there are typically 4-6 large multi-pin connectors.
3. 3

   Label and disconnect electrical connectors
   Working from top to bottom, carefully label each electrical connector with masking tape indicating its position (e.g., 'Top Left', 'Bottom Right'). Press the locking tab on each connector while pulling straight back to disconnect. Some connectors may have secondary locks that slide or rotate - inspect carefully before pulling. Do not use excessive force as connector housings can crack.
4. 4

   Disconnect ground straps
   Locate any ground straps connected to the fuse box mounting bracket. Use a 10mm socket to remove ground strap bolts. There is typically one ground connection on the left side of the bracket. Inspect ground contact surfaces - they should be clean and free of corrosion.
   Torque spec

   Ground Strap Bolt16 Nm (12 lb-ft)
5. 5

   Remove fuse box cover
   If the fuse box cover is still attached, remove it by releasing the retaining clips or removing cover screws. Some models have a hinged cover that snaps off, while others have small Phillips screws. Set cover and any removed fuses aside in a safe location.
   Torque spec

   Cover Screws14 Nm (10 lb-ft)
6. 6

   Remove fuse box mounting bolts
   Locate the mounting bolts securing the fuse box to the dash support bracket. There are typically 2-3 bolts accessible from the front and side of the unit. Use an 8mm or 10mm socket with extension to remove these bolts. Support the fuse box with one hand while removing the final bolt to prevent it from falling.
   Torque spec

   Bracket Bolts26 Nm (19 lb-ft)
7. 7

   Remove interior fuse box assembly
   With all connectors and mounting bolts removed, carefully pull the fuse box assembly forward and away from the dash mounting bracket. Maneuver the assembly out through the opening in the lower dash area. The unit may be tight due to harness routing - work slowly and avoid pulling on wires. Inspect the mounting bracket for any damage or loose hardware.
8. 8

   Inspect and clean connections
   If reinstalling the same fuse box, inspect all connector pins for corrosion, bent pins, or damage. Use electrical contact cleaner to clean connector terminals. Check the fuse box housing for cracks or melted plastic which would indicate electrical problems. If replacing, transfer any reusable components or fuses to the new unit as needed.
9. 9

   Install fuse box assembly
   Position the fuse box (new or cleaned original) into the dash mounting bracket. Align the mounting holes with the bracket. Thread in the mounting bolts by hand first to ensure proper alignment, then tighten to specification using a torque wrench. Ensure the fuse box is seated flush against the mounting bracket.
   Torque spec

   Bracket Bolts26 Nm (19 lb-ft)
10. 10

    Reconnect ground straps
    Reattach any ground straps to the fuse box mounting bracket. Ensure contact surfaces are clean and free of paint or corrosion - use a wire brush if necessary. Install ground strap bolts and torque to specification. Proper grounding is critical for electrical system function.
    Torque spec

    Ground Strap Bolt16 Nm (12 lb-ft)
11. 11

    Reconnect electrical connectors
    Referring to your labels and photos, reconnect each electrical connector to its proper location on the fuse box. Push each connector firmly until you hear or feel the locking tab click into place. Verify each connector is fully seated by gently pulling back on the harness - it should not come loose. Ensure no wires are pinched or stressed.
12. 12

    Reinstall fuse box cover
    If the fuse box cover was removed, reinstall it by aligning the cover with the fuse box body and pressing until clips engage, or install cover screws and torque to specification. Ensure the cover is properly seated to protect fuses and terminals from debris.
    Torque spec

    Cover Screws14 Nm (10 lb-ft)
13. 13

    Reinstall lower dash trim panel
    Position the lower dash trim panel and align the mounting clips with their receptacles in the dash structure. Press firmly around the perimeter until all clips snap into place. Verify the panel is flush and secure. Replace any broken clips if necessary.
14. 14

    Reconnect battery and initialize systems
    Reconnect the negative battery terminal and torque to specification - do not overtighten as this can damage the terminal. Turn the ignition to ON position (engine off) and check for warning lights. Some systems may need initialization - cycle the ignition, operate windows, and test basic electrical functions.
    ⚠Battery terminal bolts must not be overtightened - use torque wrench and follow specification exactly to avoid terminal damage.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all electrical connectors are fully seated and locked in place
2. Verify ground connections are clean and properly torqued
3. Confirm trim panels are secure with no rattles or gaps
4. Check that no tools or parts were left in the dash area

Verification

• Turn ignition to ON position and verify instrument cluster illuminates normally with no unusual warning lights
• Test all interior electrical functions: dome lights, power windows, power locks, HVAC blower, and radio
• Start engine and verify no new warning lights or messages appear
• Test exterior lighting: headlights, turn signals, brake lights, and running lights
• Verify windshield wipers and washer system operate correctly
• Check that power accessories function properly: power seats, mirrors, and outlets
• Test horn operation to confirm proper fuse box grounding
• If any systems do not operate, shut off ignition and recheck connector seating and fuse installation

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