This procedure covers the removal and replacement of the positive battery cable on a 2015-2020 Ford F-150 with the 3.5L EcoBoost engine, including disconnection from the battery terminal and starter motor.

Warnings

Tools required

Parts

• Positive battery cable × 1 — Use OEM specification or verify compatibility
• Battery terminal protective caps × 1 — Reuse if in good condition

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 if recently operated
4. Open hood and secure with prop rod
5. Locate battery in engine compartment (driver side)
6. Identify positive battery cable routing from battery to starter motor and power distribution box

Procedure

1. 1

   Disconnect negative battery terminal
   Using a 10mm socket, loosen the negative (black) battery terminal bolt. Remove the negative cable from the battery post and position it away from the battery to prevent accidental contact. Ensure it cannot swing back into contact with the terminal.
2. 2

   Disconnect positive battery terminal
   Using a 10mm socket, loosen the positive (red) battery terminal bolt. Remove the positive cable from the battery post. If the cable or terminal is corroded, clean with a wire brush before proceeding.
3. 3

   Remove battery hold-down (if necessary)
   If the battery hold-down bracket interferes with cable removal, remove the hold-down bolt using a 13mm socket. Lift the hold-down bracket away and set aside. This provides better access to trace the cable routing.
   Torque spec

   Battery Hold-Down Bolt12 Nm (9 lb-ft)
4. 4

   Disconnect cable from power distribution box
   Locate where the positive cable connects to the underhood power distribution box. Remove any protective covers. Using a 10mm socket, remove the bolt(s) securing the positive cable lug to the distribution box. Note the position and orientation of any other wires sharing the same connection point.
5. 5

   Access starter motor connection
   From underneath the vehicle or through the engine bay (access varies), locate the starter motor on the passenger side of the engine block. Identify the positive cable connection at the starter solenoid terminal (larger terminal with battery cable).
6. 6

   Disconnect cable from starter motor
   Remove the protective rubber boot from the starter solenoid terminal. Using a 13mm socket, remove the nut securing the positive cable lug to the starter solenoid. Carefully remove the cable lug from the terminal stud. If multiple cables are stacked, note their order for reassembly.
7. 7

   Remove cable routing clips
   Trace the cable path and release any routing clips, cable ties, or harness retainers securing the positive cable to the vehicle chassis or engine. Note the routing path for installation of the new cable.
8. 8

   Remove old positive cable
   Carefully remove the complete positive battery cable from the vehicle, ensuring it clears all components. Inspect the cable routing path for any damage or wear points that may have contributed to cable failure.
9. 9

   Install new positive cable
   Route the new positive battery cable along the same path as the original, ensuring it does not contact sharp edges, hot exhaust components, or moving parts. Secure the cable in all original routing clips and positions.
10. 10

    Connect cable to starter motor
    Install the positive cable lug onto the starter solenoid terminal stud in the correct position (reference notes from removal). Install any additional cables in their original order. Install the nut and tighten securely with a 13mm socket. Replace the protective rubber boot over the terminal.
11. 11

    Connect cable to power distribution box
    Install the positive cable lug onto the power distribution box terminal in the correct position and orientation. Reinstall any additional wires in their original positions. Install the mounting bolt and tighten to specification using a torque wrench with 10mm socket.
    Torque spec

    Module Mounting Bolts8 Nm (6 lb-ft)
12. 12

    Connect positive battery terminal
    Clean the positive battery post with a wire brush if necessary. Install the positive cable terminal onto the battery post, ensuring full contact. Install the terminal bolt and tighten to specification using a torque wrench with 10mm socket. Do not overtighten.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)
13. 13

    Reinstall battery hold-down
    If removed, position the battery hold-down bracket over the battery. Install the hold-down bolt and tighten to specification using a torque wrench. Ensure the battery is secure but the bracket is not overtightened.
    Torque spec

    Battery Hold-Down Bolt12 Nm (9 lb-ft)
14. 14

    Reconnect negative battery terminal
    Clean the negative battery post if necessary. Install the negative cable terminal onto the battery post. Install the terminal bolt and tighten to specification using a torque wrench with 10mm socket. Do not overtighten.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Apply battery terminal protector spray to both terminals to prevent corrosion
2. Replace any protective covers on the power distribution box
3. Verify all cable routing is secure and clear of moving parts
4. Double-check that all connections are tight and properly seated

Verification

• Turn ignition to ON position (do not start) and verify dash lights illuminate normally
• Check for proper operation of electrical accessories (lights, radio, power windows)
• Start the engine and verify normal operation with no warning lights
• Perform window auto-up/down relearn if necessary by fully opening then fully closing each window using the auto function
• Reset radio presets and clock as needed
• Visually inspect all connections for proper seating and security
• Verify no loose tools or parts remain in engine compartment

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