how to fix my Ford F-150 13th Generation (2015-2020) headlights flickering

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

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

485 words

Problem Statement

Learn how to diagnose and fix flickering headlights on your Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid short circuits or shocks

Symptoms

•Headlights flickering on and off
•Dimming of headlights at idle or while using other electrical components
•Dashboard warning lights illuminated
•Increased frequency of flickering during engine start
•Possible buzzing or clicking noise from the headlight switch

Diagnostic Steps

1
Check battery voltage using a multimeter to ensure it is within the proper range (12.4-12.7 volts)
2
Inspect the headlight bulbs for damage or loose connections
3
Test the alternator output to verify it is charging correctly (should be around 13.8-14.4 volts with the engine running)
4
Scan for error codes using an OBD-II scanner to identify any related electrical issues
5
Examine the headlight relay and fuses for any signs of failure or corrosion
6
Inspect wiring harnesses for frayed wires or poor ground connections

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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

•Multimeter
•Socket set
•OBD-II scanner
•Wire brush
•Electrical tape

Parts Required

•Headlight bulbs (if needed)
•Headlight relay (if needed)

Related Faults

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Diagnostic Steps

1
Check battery voltage using a multimeter to ensure it is within the proper range (12.4-12.7 volts)
2
Inspect the headlight bulbs for damage or loose connections
3
Test the alternator output to verify it is charging correctly (should be around 13.8-14.4 volts with the engine running)
4
Scan for error codes using an OBD-II scanner to identify any related electrical issues
5
Examine the headlight relay and fuses for any signs of failure or corrosion
6
Inspect wiring harnesses for frayed wires or poor ground connections

Solution

1. Preparation

Gather tools: Multimeter, socket set, OBD-II scanner, wire brush, electrical tape
Park the vehicle on a level surface, and turn off the engine.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Headlight Bulbs

Open the hood and locate the headlight assembly.
Remove the headlight cover by unscrewing or unclipping it.
Disconnect the power connector from the back of the bulb.
Remove the old bulb by turning it counterclockwise and pulling it out.
Insert the new bulb, ensuring not to touch the glass with bare hands (use gloves).
Reconnect the power connector and replace the headlight cover.

3. Check and Replace the Headlight Relay

Locate the fuse box (refer to the owner’s manual for the exact location).
Identify the headlight relay and remove it from the socket.
Test the relay with a multimeter for continuity.
If faulty, replace the relay with a new one, ensuring it matches the specifications.

4. Test the Alternator

Reconnect the negative battery terminal.
Start the engine and use a multimeter to check the voltage at the battery terminals (should read between 13.8-14.4 volts).
If the voltage is low, consider replacing the alternator.