my Ford F-150 12th Generation (2009-2014) has lost power to the rear lights, what should I check?

Ford F-150 12th Generation (2009-2014)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

621 words

Problem Statement

Learn how to diagnose and fix rear light power loss in Ford F-150 12th Generation (2009-2014). Step-by-step guide with tools and safety tips.

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 shock or short circuits.
•Allow the vehicle to cool before touching any components that may be hot.

Symptoms

•Rear lights do not illuminate
•Brake lights are non-functional
•Turn signals at the rear are inoperable
•No illumination from reverse lights
•Check engine light may be illuminated

Diagnostic Steps

1
Check the fuse for the rear lights using the fuse box diagram in the owner’s manual.
2
Inspect the wiring harness leading to the rear lights for any visible damage or corrosion.
3
Test the bulbs in the rear lights to ensure they are not burnt out.
4
Use a multimeter to check for voltage at the rear light connectors.
5
Verify the function of the brake light switch under the dashboard.
6
Inspect ground connections for the rear light assembly to ensure proper grounding.

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
•Fuse puller
•Wire brush
•Screwdriver set
•Pliers

Parts Required

•Replacement fuses (as needed)
•Replacement bulbs (as needed)
•Brake light switch (if faulty)

Related Faults

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Diagnostic Steps

1
Check the fuse for the rear lights using the fuse box diagram in the owner’s manual.
2
Inspect the wiring harness leading to the rear lights for any visible damage or corrosion.
3
Test the bulbs in the rear lights to ensure they are not burnt out.
4
Use a multimeter to check for voltage at the rear light connectors.
5
Verify the function of the brake light switch under the dashboard.
6
Inspect ground connections for the rear light assembly to ensure proper grounding.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface with the engine off.
Disconnect the negative battery terminal to prevent electrical shock.

2. Check and Replace Fuse

Locate the fuse box, typically found under the dashboard or in the engine compartment.
Identify the fuse related to the rear lights using the diagram.
Remove the fuse using a fuse puller or pliers.
Inspect the fuse; if it is blown, replace it with a fuse of the same amperage (check the owner's manual for specifications).

3. Inspect Wiring and Connectors

Remove the rear light assembly by unscrewing or unclipping it.
Inspect the wiring harness for any signs of damage, fraying, or corrosion.
Clean any corroded connectors with electrical contact cleaner and a brush.
Repair or replace damaged wires as necessary.

4. Test and Replace Bulbs

Remove the bulbs from the rear light assembly.
Visually inspect each bulb for filament breakage or discoloration.
Test each bulb with a multimeter to confirm functionality.
Replace any defective bulbs with new ones of the correct type.

5. Check Brake Light Switch

Locate the brake light switch, usually mounted near the top of the brake pedal.
Inspect the switch for any physical damage or misalignment.
Use a multimeter to check if the switch is working when the brake pedal is pressed.
Replace the switch if it is faulty.

6. Inspect Ground Connections

Locate the ground wire for the rear lights, typically connected to the vehicle frame near the rear light assembly.
Ensure the connection is clean, tight, and free of rust.
Clean the ground connection with a wire brush if corroded, or replace the ground wire if damaged.