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Home/Cars/Ford/F-150/13th Generation (2015-2020)/how to diagnose Ford F-150 13th Generation (2015-2020) electrical issues?

how to diagnose Ford F-150 13th Generation (2015-2020) electrical issues?

Ford F-150 13th Generation (2015-2020)

Severity: highDifficulty: medium2-4 hours
3 min read
585 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix electrical issues in Ford F-150 13th Generation (2015-2020). Step-by-step guide with symptoms, diagnostic steps, and tools required.

Component
Electrical
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems to prevent shock or short circuits.
  • ⚠Allow the engine to cool before working on any components to prevent burns.

Symptoms

  • •Check engine light illuminated
  • •Inconsistent power to electrical components (e.g., lights, radio, windows)
  • •Difficulty starting the engine
  • •Battery drains quickly or fails to hold a charge
  • •Intermittent loss of power while driving
  • •Electrical accessories not functioning properly

Diagnostic Steps

  1. 1Scan the vehicle's computer system for Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
  2. 2Inspect the battery terminals and cables for corrosion or loose connections.
  3. 3Check the vehicle’s fuses to ensure none are blown; replace any found defective.
  4. 4Use a multimeter to measure battery voltage and ensure it reads between 12.4V and 12.7V at rest.
  5. 5Test the alternator output with the engine running; it should produce between 13.5V and 14.5V.
  6. 6Inspect wiring harnesses for frayed wires or poor connections, especially in areas exposed to heat or moisture.
  7. 7Verify ground connections by checking for resistance and making sure they are securely attached.

Solution

Solution

1. Preparation

  • Gather tools and materials.
  • Disconnect the negative battery cable to prevent electrical shock.
  • Safety goggles and gloves should be worn.

2. Battery Inspection

  • Sub-steps:
    • Remove the battery terminals (negative first, then positive).
    • Inspect terminals for corrosion; clean with a wire brush if necessary.
    • Perform a load test on the battery to ensure it holds charge.
  • Tools Required: Wire brush, battery terminal cleaner, battery load tester.

3. Fuse and Relay Check

  • Sub-steps:
    • Locate the fuse box (usually under the dashboard or hood).
    • Inspect each fuse with a fuse tester; replace any blown fuses with the correct amperage.
    • Check relays for proper operation by swapping with a similar relay if available.
  • Tools Required: Fuse tester, pliers.

4. Alternator Testing

  • Sub-steps:
    • Reconnect the battery.
    • Start the engine and measure voltage at the battery terminals.
    • If the voltage is below 13.5V, replace the alternator; if above 14.5V, check for voltage regulator issues.
  • Tools Required: Multimeter.

5. Wiring Repair

  • Sub-steps:
    • Identify any damaged wiring during the visual inspection.
    • Use heat shrink tubing or electrical tape to repair frayed wires.
    • Ensure all ground connections are tight and free of rust.
  • Tools Required: Electrical tape, heat shrink tubing, wire cutters/strippers, soldering iron (if necessary).

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Multimeter
  • Wire brush
  • Battery load tester
  • Fuse tester
  • Pliers
  • Electrical tape
  • Heat shrink tubing
  • Wire cutters/strippers
  • Soldering iron (if necessary)

Parts Required

  • Replacement fuses (as needed)
  • Replacement alternator (if faulty)
  • Battery (if defective)

Additional Information

Component

Electrical

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

10 items

Parts

3 items

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