my Ford F-150 13th Generation (2015-2020) headlights flicker when I turn them on

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

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

534 words

Problem Statement

Learn how to diagnose and fix flickering headlights in a 2015-2020 Ford F-150. Step-by-step guide with symptoms, diagnostic steps, 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 prevent shock and short circuits.

Symptoms

•Headlights flicker intermittently when switched on
•Dashboard lights may dim or flicker alongside headlights
•Possible clicking sound from the headlight relay
•Difficulty in starting the vehicle (if battery-related)
•Increased frequency of blown fuses related to headlights

Diagnostic Steps

1
Inspect the headlight bulbs for any signs of damage or improper installation.
2
Check the headlight fuses in the fuse box for continuity and replacement if blown.
3
Use an OBD-II scanner to check for any stored trouble codes related to electrical issues.
4
Inspect the wiring harness and connectors associated with the headlights for corrosion or loose connections.
5
Test the battery voltage under load to ensure it is supplying adequate power.
6
Check the headlight relay for proper operation and replace if necessary.

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
•Screwdriver set
•Electrical contact cleaner

Parts Required

•Headlight bulbs (if faulty)
•Fuses (if blown)
•Headlight relay (if faulty)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the headlight bulbs for any signs of damage or improper installation.
2
Check the headlight fuses in the fuse box for continuity and replacement if blown.
3
Use an OBD-II scanner to check for any stored trouble codes related to electrical issues.
4
Inspect the wiring harness and connectors associated with the headlights for corrosion or loose connections.
5
Test the battery voltage under load to ensure it is supplying adequate power.
6
Check the headlight relay for proper operation and replace if necessary.

Solution

1. Preparation

Gather all tools and parts needed.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect Headlight Bulbs

Remove the headlight assembly by unscrewing the retaining screws.
Disconnect the bulb connectors and visually inspect bulbs for any signs of blackening or broken filaments.
Replace any faulty bulbs with new, compatible ones (use OEM parts where possible).

3. Check and Replace Fuses

Locate the fuse box (typically under the dashboard or in the engine compartment).
Identify the headlight fuse using the diagram on the fuse box cover.
Use a multimeter to check the fuse for continuity; replace if blown with an OEM-rated fuse (usually 10-15A).

4. Inspect Wiring and Connectors

Visually inspect the wiring harness and connectors for fraying, corrosion, or loose connections.
Clean any corroded connections with electrical contact cleaner and ensure all connections are tight.

5. Test Battery Voltage

Use a multimeter to check the battery voltage (should be around 12.6V when not running).
If voltage drops below 12V under load (i.e., when headlights are on), consider replacing the battery.

6. Check and Replace Headlight Relay

Locate the headlight relay in the relay box (refer to the vehicle manual for specific location).
Remove the relay and test it with a multimeter for continuity.
Replace with a new relay if it fails the test.