my Ford F-150's rear lights are not working, what should I inspect

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

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

508 words

Problem Statement

Learn how to diagnose and fix rear lights not working on 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 battery before working on electrical systems to prevent shorts.

Symptoms

•Rear brake lights do not illuminate when the brake pedal is pressed
•Rear turn signals are inoperative
•Reverse lights fail to activate when in reverse gear
•Dashboard warning lights may illuminate
•Possible blown fuses related to the lighting system

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of burning out or damage.
2
Check the fuse box for blown fuses related to the rear lights.
3
Use a multimeter to test the voltage at the rear light sockets.
4
Examine the wiring harness for any visible damage or corrosion.
5
Verify that the brake pedal switch is functioning properly.
6
Test the vehicle's lighting control switch for proper operation.

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
•Screwdrivers

Parts Required

•Replacement bulbs (if necessary)
•Fuses (if necessary)

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Diagnostic Steps

1
Inspect the rear light bulbs for any signs of burning out or damage.
2
Check the fuse box for blown fuses related to the rear lights.
3
Use a multimeter to test the voltage at the rear light sockets.
4
Examine the wiring harness for any visible damage or corrosion.
5
Verify that the brake pedal switch is functioning properly.
6
Test the vehicle's lighting control switch for proper operation.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative battery terminal to ensure safety.
Tools Required:
- Socket set
- Multimeter
- Screwdrivers
- Replacement bulbs (if necessary)
- Fuses (if necessary)

2. Inspect and Replace Bulbs

Remove the rear light assembly by unscrewing the retaining screws.
Pull the light assembly away from the vehicle.
Remove the bulbs by twisting them counterclockwise or pulling them straight out (depending on design).
Inspect bulbs for filament breakage or discoloration; replace if necessary with the correct type.
Reassemble the light assembly and secure it with screws.

3. Check and Replace Fuses

Locate the fuse box (usually found under the dashboard or in the engine compartment).
Remove the cover and identify the fuse related to the rear lights (consult the owner's manual for exact location).
Visually inspect the fuse; if broken, replace it with a new fuse of the same amperage rating.
Reinstall the fuse box cover.

4. Test Wiring and Switches

Use a multimeter to check for voltage at the rear light sockets when the lights are activated.
If no voltage is present, trace the wiring back to the fuse box and check for continuity.
Inspect the brake pedal switch, ensuring it activates when the pedal is pressed; replace the switch if defective.
Ensure the lighting control switch is operational, replacing it if necessary.