how to diagnose electrical problems in my Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather necessary tools and ensure the vehicle is parked on a flat surface.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Clean Battery Terminals

• Remove the battery connections, starting with the negative terminal.
• Inspect for corrosion and clean terminals using a wire brush and a solution of baking soda and water.
• Reconnect the terminals securely.

3. Replace Blown Fuses

• Identify blown fuses from the fuse box using the vehicle's manual for the location.
• Replace any blown fuses with the correct amperage rating as specified by the manufacturer.

4. Repair or Replace Damaged Wiring

• Locate any damaged wiring in the harness using visual inspection.
• Repair damaged sections with electrical tape or heat-shrink tubing.
• If necessary, replace the damaged wiring with new wire of the same gauge.

5. Test and Replace Faulty Components

• Check the voltage output of the alternator using a multimeter (should be around 13.8 to 14.4 volts when running).
• If the alternator is faulty, remove it by disconnecting the battery again, removing the serpentine belt, and unbolting the alternator.
• Install a new alternator and reconnect all components.