This procedure covers the removal and replacement of the engine bay fuse box (underhood electrical center) on a 2014-2018 Chevrolet Silverado 1500 with the 5.3L V8 L83 engine.

Warnings

Tools required

Parts

• Underhood fuse box assembly × 1 — ACDelco 84102723 or equivalent
• Fuse box mounting bracket (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn ignition off and remove key from vehicle
3. Allow engine to cool completely if recently operated
4. Open hood and secure with prop rod
5. Photograph the fuse box and all visible connections from multiple angles for reference
6. Disconnect negative battery terminal first, then positive terminal
7. Wait at least 2 minutes for capacitors to discharge

Procedure

1. 1

   Remove fuse box cover
   Locate the fuse box on the driver's side of the engine bay near the battery. Release the cover tabs by pressing inward on both sides and lift the cover straight up to remove. Set aside in a clean location.
2. 2

   Document and remove all fuses and relays
   Using the fuse box diagram on the cover or in your owner's manual, photograph the location of all fuses and relays. Remove each fuse and relay, labeling them or placing them in a marked container that corresponds to their position. This ensures proper reinstallation and preserves any custom fuse configurations.
   ℹ️Keep fuses organized by position. Some circuits use different amperage fuses depending on vehicle options.
3. 3

   Disconnect battery cable connections at fuse box
   Locate the large battery cable connections on the fuse box (typically red or orange cables from the battery). Remove the terminal bolts securing these cables to the fuse box studs. Carefully move cables aside to provide clearance.
   Torque spec

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

   Disconnect primary electrical harness connectors
   The fuse box has several large multi-pin harness connectors on its underside and sides. Press the locking tabs on each connector while pulling firmly straight out. These connectors are typically gray or black and may require significant force. There are usually 3-5 large connectors depending on vehicle options. Do not twist or rock the connectors as this can damage pins.
   ⚠Connector locking tabs are fragile. Use a small flathead screwdriver to assist with release if needed, but do not pry directly on the connector body.
5. 5

   Remove ground strap connections
   Locate the ground strap(s) connected to the fuse box mounting bracket or body attachment points. Remove the ground strap bolts. Note the position and routing of each ground strap for reinstallation. Clean the contact surfaces with a wire brush or sandpaper to ensure good electrical contact during reassembly.
   ℹ️Ground straps must have clean, bare metal contact on both ends. Remove any paint, rust, or corrosion before reinstallation.
   Torque spec

   Ground Strap Bolt16 Nm (12 lb-ft)

   Ground Bolt17 Nm (13 lb-ft)
6. 6

   Disconnect auxiliary connectors and sensors
   Check for any smaller connectors attached to modules mounted on or near the fuse box. This may include the Engine Control Module (ECM) connectors, ABS module connectors, or other control modules. Release the locking mechanisms and disconnect each connector, photographing each before removal.
7. 7

   Remove fuse box mounting bolts
   Locate the mounting bolts securing the fuse box to the inner fender or mounting bracket. There are typically 3-4 bolts. Remove all mounting bolts completely. Support the fuse box with one hand while removing the final bolt to prevent it from falling.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)

   Bracket Bolts26 Nm (19 lb-ft)
8. 8

   Remove fuse box assembly
   Carefully lift the fuse box assembly straight up and out of the engine bay. Be aware of any remaining wire harnesses or hoses that may still be attached. Inspect the mounting area for any debris, corrosion, or damage that should be addressed before installing the new unit.
9. 9

   Prepare new fuse box for installation
   Unpack the new fuse box assembly and compare it to the old unit to verify correct part. Transfer any modules, brackets, or components from the old fuse box to the new one if they are not included. Clean all mounting surfaces on the vehicle where the fuse box will be installed.
10. 10

    Install new fuse box assembly
    Position the new fuse box into the mounting location, ensuring all mounting holes align properly. Thread in all mounting bolts by hand first to ensure proper alignment, then tighten to specification in a cross-pattern to ensure even seating.
    Torque spec

    Module Mounting Bolts8 Nm (6 lb-ft)

    Bracket Bolts26 Nm (19 lb-ft)
11. 11

    Reconnect ground straps
    Reattach all ground straps to their original positions. Ensure contact surfaces are clean and bare metal is making contact. Install ground strap bolts and tighten to specification.
    ℹ️Poor ground connections can cause erratic electrical behavior and fault codes. Verify clean, tight connections.
    Torque spec

    Ground Strap Bolt16 Nm (12 lb-ft)

    Ground Bolt17 Nm (13 lb-ft)
12. 12

    Reconnect all electrical harness connectors
    Reconnect all large harness connectors to the fuse box in their original positions using your reference photos. Push each connector in firmly until you hear or feel the locking tab click into place. Gently tug on each connector to verify it is fully seated and locked.
    ⚠Misaligned pins can cause permanent damage. Ensure connectors are properly aligned before applying force.
13. 13

    Reconnect battery cable connections
    Reattach the battery cable connections to the fuse box studs. Ensure cables are routed properly and not pinched or stretched. Install terminal bolts and tighten to specification. Do not overtighten as this can damage the fuse box terminals.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)
14. 14

    Reinstall fuses and relays
    Using your photos and labels, reinstall all fuses and relays to their correct positions in the fuse box. Ensure each fuse is fully seated in its holder. Verify that all fuse amperages match the original configuration.
15. 15

    Reconnect battery and test
    Reconnect the positive battery terminal first, then the negative terminal. Tighten battery terminal bolts to specification. Turn the ignition to the ON position without starting the engine. Check for any warning lights or unusual indicators on the instrument cluster.
    ℹ️Some warning lights are normal on first startup after fuse box replacement and may require a drive cycle to clear.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Install the fuse box cover by aligning the tabs and pressing down until it clicks into place
2. Verify all tool and parts are removed from engine bay
3. Secure hood and ensure it latches properly

Verification

• Turn ignition to ON position and verify all electrical systems function: lights, horn, power windows, radio, HVAC blower, and instrument cluster
• Start the engine and verify it runs normally without warning lights (some codes may require clearing with a scan tool)
• Test all critical systems including headlights, turn signals, brake lights, windshield wipers, and power accessories
• Use a scan tool to check for any stored diagnostic trouble codes and clear if appropriate
• Perform a test drive to verify all vehicle systems operate normally, including ABS, traction control, and stability control
• Check for proper charging system operation (battery voltage should be 13.5-14.5V with engine running)
• Verify no loose connections or rattles from the fuse box area

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