how to fix the tail lights on my Ford F-150 13th Generation (2015-2020) that won't work

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

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

487 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 tail lights not working on Ford F-150 (2015-2020). 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 short circuits.
•Allow the vehicle to cool down before inspecting any components that may have been in operation.

Symptoms

•Tail lights do not illuminate when headlights are turned on
•Brake lights are non-functional
•Turn signal lights not working
•Check for blown fuses in the tail light circuit
•Dashboard warning light illuminated

Diagnostic Steps

1
Inspect the tail light bulbs for any signs of damage or burnout.
2
Check the fuse related to the tail light circuit using the fuse box diagram.
3
Use a multimeter to test for voltage at the tail light socket.
4
Inspect the wiring harness and connectors for any signs of corrosion or damage.
5
Scan the vehicle with an OBD-II scanner for any fault codes related to the lighting system.

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

•Socket set
•Multimeter
•Screwdriver

Parts Required

•Replacement tail light bulbs
•Electrical contact cleaner

Related Faults

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Diagnostic Steps

1
Inspect the tail light bulbs for any signs of damage or burnout.
2
Check the fuse related to the tail light circuit using the fuse box diagram.
3
Use a multimeter to test for voltage at the tail light socket.
4
Inspect the wiring harness and connectors for any signs of corrosion or damage.
5
Scan the vehicle with an OBD-II scanner for any fault codes related to the lighting system.

Solution

1. Preparation

Gather tools and parts for the repair.
Tools Required:
- Socket set
- Multimeter
- Screwdriver
- Replacement bulbs (if needed)

2. Remove Tail Light Assembly

Open the tailgate and locate the tail light assembly.
Using a screwdriver, remove the screws securing the tail light.
Gently pull the tail light assembly away from the vehicle, disconnecting the wiring harness.

3. Inspect and Replace Bulbs

Remove the bulb sockets from the tail light assembly by twisting them counterclockwise.
Inspect each bulb; replace any that are burnt out with new bulbs (use OEM replacement parts for best results).
Reinsert the bulb sockets back into the assembly and ensure they are secured.

4. Check Wiring and Connectors

Inspect the wiring harness for any frayed wires or corrosion.
Clean any corroded connectors with an electrical contact cleaner.
If necessary, repair or replace damaged wiring or connectors.

5. Reassemble Tail Light Assembly

Reconnect the wiring harness to the tail light assembly.
Position the tail light assembly back into place and secure it with screws.
Close the tailgate.

6. Test Functionality

Turn on the vehicle and check the tail lights, brake lights, and turn signals to confirm they are functioning properly.