Have you ever wondered why your tail lights aren't working, but your brake lights are? Not only you, this common issue can leave many drivers wondering what went wrong, as it compromises their vehicle's visibility to other drivers. Don’t worry. You don’t need to look no further anywhere else. We’ve got you covered with this article.

With this article, we discuss about six common reasons to answer why your tail lights might not be working while your brake lights are. Doesn’t matter whether you're an experienced car enthusiast or just trying to keep your vehicle in good condition. Whatever the reason that triggered your online search, we invite you to read on as we explore the possible causes and solutions to get your tail lights working again.

So, without further ado, let’s get started…

Common Causes for Tail Lights Not Working But Brake Lights Are

1. Faulty Tail Light Bulbs

One of the most frequent reasons your tail lights are not working while brake lights are working finely is due to faulty tail light bulbs. In many vehicles, the brake light and tail light use the same dual filament bulb. Hence, if one of these filaments breaks, the tail light may stop working while the brake light continues to function.

How to identify a Burned-Out Bulb?

There are mainly two ways that you can try out yourself to check if the bulb is the issue:

1. Visual Inspection: Turn on your car's lights and observe the tail lights. If one light is out, you may have a burned-out bulb.
2. Filament Check: Remove the bulb and inspect the filament for breaks or black spots(this works only if the bulbs are made of filament bulbs instead of LED).

Identifying a faulty bulb can save you from unnecessary troubleshooting of other components. 

How to Replace a Tail Light Bulb?

Replacing a tail light bulb is straightforward: DIY

1. Access the Tail Light Housing: Locate the tail light housing in the trunk or rear panel.
2. Remove the Housing: Remove any screws or clips holding the housing.
3. Replace the Bulb: Carefully pull out the old bulb and replace it with a new one. Ensure the bulb type matches your vehicle’s specifications.
4. Reassemble: Reassemble the housing and test the lights.

2. Blown Fuses

A blown fuse is another common cause for tail lights not working while brake lights are working fine. The fuse protects the light circuit from overcurrent. If it blows, the tail lights will stop working.

How to Check The Fuse Box That Has Been Connected To Your Tail Lights?

To diagnose a blown fuse:

1. Locate the Fuse Box: Usually found under the dashboard or in the engine compartment.
2. Identify the Tail Light Fuse: Use your car's manual to identify the tail light fuse.
3. Inspect the Fuse: Check the fuse for signs of damage, such as a broken wire inside the fuse or scorch marks. You can also use a multimeter to test it for continuity.

How to Replace a Blown Fuse?

If you find a blown fuse:

1. Remove the Faulty Fuse: Use a fuse puller to remove the faulty fuse.
2. Replace with a New Fuse: Replace it with a new fuse of the same amperage.
3. Test the Tail Lights: Turn on your car lights to ensure the tail lights are working.

Regularly checking your fuses can prevent unexpected tail light failures.  

3. Wiring Issues

Wiring issues can also cause your tail lights to stop working while the brake lights remain functional. Over time, wires can become frayed, loose, or corroded, leading to electrical problems.

How to Diagnose Wiring Problems Regard to Your Vehicle’s Tail Lights?

To check for wiring issues:

1. Visual Inspection: Inspect the wiring harness for visible damage, such as frayed wires or loose connections.
2. Multimeter Test: Use a multimeter to test for continuity and proper voltage along the wiring.

How to Repair or Replace Damaged Wires?

If you find damaged wires:

1. Disconnect the Battery: Always disconnect the battery before working on electrical components.
2. Repair or Replace Wires: Repair minor damage with electrical tape or replace the damaged section of the wire.
3. Reconnect and Test: Reconnect the battery and test the lights to ensure the repair was successful.

Proper wiring maintenance is crucial for the reliable operation of your vehicle’s lighting system.  

4. Faulty Light Switch

The light switch on your dashboard controls both the headlights and tail lights. A malfunctioning switch might affect only the tail lights, leading to them not working while the brake lights do.

How To Test the Light Switch?

To diagnose a faulty light switch:

1. Headlight and Tail Light Check: Turn on the headlights and tail lights. The switch might be faulty if the tail lights do not come on.
2. Multimeter Test: Use a multimeter to test the switch for continuity and proper function.

How to Replace a Faulty Light Switch?

If the switch is faulty:

1. Remove the Switch: Remove the switch from the dashboard.
2. Disconnect the Wiring Harness: Disconnect the wiring harness from the switch.
3. Install a New Switch: Install a new switch and reconnect the wiring.
4. Test the Lights: Test the lights to ensure the new switch works correctly.

Regularly testing your light switch can prevent unexpected lighting failures.  

5. Corroded Sockets

Tail light sockets can corrode over time due to exposure to moisture and dirt. This corrosion can prevent the bulbs from making a good electrical connection, causing the tail lights to fail.

What are the Signs of Corrosion in Light Sockets?

To check for corrosion:

1. Visual Inspection: Inspect the tail light sockets for discoloration, rust, or buildup.
2. Multimeter Test: Use a multimeter to test for continuity. Corrosion can interrupt the electrical flow, leading to faulty tail lights.

How to Clean or Replace Corroded Sockets?

If you find corrosion:

1. Clean the Sockets: Clean the sockets with a wire brush and contact cleaner to remove rust and buildup.
2. Replace if Necessary: If cleaning doesn't help, replace the socket.
3. Test the Lights: Test the lights to ensure proper function.

Maintaining clean and corrosion-free sockets is essential for reliable tail light operation.  

6. Malfunctioning in Control Module

Modern vehicles use control modules to manage lighting functions. A malfunctioning module can cause the tail lights to fail while leaving the brake lights unaffected.

What is the Role of a Control Module within Your Vehicle?

The control module receives input from various sensors and switches to control the tail lights. A fault in this module can disrupt the tail light operation.

How to Repair or Replace the Control Module?

If you suspect a faulty module:

1. Consult a Professional: Control module issues can be complex. Consult a professional mechanic for accurate diagnosis.
2. Replace the Module: If necessary, replace the control module.
3. Test the Lights: Test the tail lights to ensure they are working properly after the replacement.

Regular maintenance and prompt repairs of the control module can prevent lighting issues.  

Why Is It Better To Switch To LED Tail Lights Instead Of Other Tail Light Types?

Switching to LED tail lights offers several advantages over traditional incandescent or halogen tail lights. Here are some reasons why LED tail lights are considered a better option:

1. Energy Efficiency: LED lights consume less power compared to incandescent or halogen bulbs, which translates to lower energy consumption from your vehicle's electrical system. This can help improve fuel efficiency and reduce overall energy usage.
2. Longer Lifespan: LED tail lights have a significantly longer lifespan than traditional bulbs. While incandescent bulbs may last around 1,000 to 2,000 hours, LED lights can last up to 25,000 hours or more. This means fewer replacements and lower maintenance costs over time.
3. Brightness and Visibility: LEDs produce a brighter and more focused light, which enhances visibility for other drivers. This can improve safety, especially during nighttime driving or in adverse weather conditions.
4. Faster Response Time: LED lights light up almost instantly when compared to incandescent bulbs. This quicker response time can provide an extra margin of safety, giving other drivers more time to react to your vehicle’s braking or turning signals.
5. Durability: LEDs are more resistant to shock and vibrations, which makes them more durable in various driving conditions. This can be particularly beneficial for vehicles that are used in rugged environments or for off-road purposes.
6. Design Flexibility: LED lights are smaller and more versatile in design, allowing for more creative and aesthetically pleasing tail light designs. This can enhance the overall look of your vehicle.
7. Heat Emission: LEDs emit very little heat compared to incandescent bulbs, reducing the risk of heat-related damage to the tail light housing and surrounding components.
8. Environmental Impact: LED lights are more environmentally friendly as they contain no harmful substances like mercury and have a longer lifespan, reducing waste and the frequency of replacements.

4 Maintaining Tips For Your Vehicle's Tail Lights

Maintaining your vehicle's tail lights is essential for ensuring visibility, safety, and compliance with road regulations. Here are some maintenance tips to keep your tail lights in good condition:

1. Regular Inspection: Periodically inspect your tail lights to check for any cracks, moisture buildup inside the lens, or damage to the housing. Catching issues early can prevent further damage and ensure your lights function properly.
2. Cleanliness: Keep the tail light lenses clean to maintain optimal brightness. Use a mild soap and water solution with a soft cloth to gently clean the lenses. Avoid abrasive cleaners or rough materials that could scratch the lens.
3. Troubleshooting Common Issues: If your vehicle's tail lights are not functioning correctly, check these common issues:

• Burnt-Out Bulbs: Replace any non-working bulbs promptly.
• Loose Connections: Ensure all electrical connections are tight and secure.
• Blown Fuses: Check and replace any blown fuses in your vehicle’s fuse box.

4. Consult Owner’s Manual:

• Guidance: Refer to your vehicle’s owner’s manual for specific maintenance recommendations and guidelines provided by the manufacturer.
• Follow Instructions: Follow any specific instructions for bulb replacement, cleaning, or maintenance to ensure proper operation and warranty compliance.

Final Thoughts

Identifying why your tail lights are not working while your brake lights are functional is crucial for maintaining your vehicle's safety and visibility. 

This article outlines common issues, such as faulty bulbs, blown fuses, wiring problems, malfunctioning light switches, corroded sockets, and control module issues, and offers a comprehensive guide to diagnosing and resolving these problems. 

Furthermore, regular maintenance, including inspections, cleaning, and timely replacements, can prevent these issues and ensure your tail lights operate correctly. Keeping your vehicle's tail lights in good condition is not only a matter of safety but also compliance with road regulations. 

By following these tips and guidelines, you can keep your vehicle well-maintained and safe on the road.

Where to Buy the Best LED Tail Lights in 2024?

Looking for high-quality LED tail lights to enhance your vehicle’s performance and style? At Carifex, we specialize in offering a wide range of the latest LED products(LED Headlights, LED Tail Lights, LED Fog Lights, and many more) designed specifically for automobiles, including for your vehicle. 

Here’s why Carifex is your go-to source:

• Quality Assurance: We pride ourselves on providing LED tail lights that meet stringent quality standards, ensuring durability and reliable performance.
• Wide Selection: Explore our diverse inventory featuring various styles and designs to suit your vehicle’s aesthetic preferences and functional needs.
• Competitive Pricing: Enjoy affordable prices without compromising on quality. We strive to offer the best value for your investment.
• Customer Satisfaction: With a commitment to excellent customer service, we’re here to assist you every step of the way, from selection to installation advice.

Browse our collection of tail lights and other LED automotive products today. Click below to visit our store and find the perfect upgrades for your vehicle!

Check Our Store

Key Points 

• Dual filament bulbs can have one filament break, causing tail lights to fail while brake lights still work.
• Check for burned-out filaments and replace bulbs if necessary.
• Fuses protect the light circuit from overcurrent; a blown fuse can disable tail lights.
• Locate the fuse box, identify the tail light fuse, and replace it if blown.
• Frayed, loose, or corroded wires can interrupt the electrical flow to tail lights.
• Inspect the wiring harness for damage and repair or replace as needed.
• The dashboard light switch controls both headlights and tail lights; a faulty switch can disrupt tail lights.
• Test the switch with a multimeter and replace it if faulty.
• Exposure to moisture and dirt can corrode light sockets, preventing a good electrical connection.
• Clean the sockets with a wire brush and contact cleaner, or replace them if necessary.
• Modern vehicles use control modules to manage lighting functions; a faulty module can disrupt tail light operation.
• Consult a professional mechanic for diagnosis and replace the control module if needed.
• Use a multimeter for continuity tests and visually inspect all related components.
• Regular maintenance and timely repairs ensure reliable vehicle lighting.
• Driving with non-functioning tail lights is unsafe and may be illegal.
• Promptly address any tail light issues to maintain vehicle safety and compliance with traffic laws.

FAQs

Can a Bad Ground Cause Tail Lights Not to Work?

Yes, a bad ground can prevent tail lights from working by disrupting the electrical flow. Check the ground connections and clean or repair as needed.

How Do I Know if My Tail Light Relay Is Bad?

If your tail lights do not work despite good bulbs and fuses, the relay may be faulty. Test the relay with a multimeter and replace if necessary.

What Should I Do if Both Tail Lights Are Not Working?

If both tail lights are not working, check the fuse, bulbs, wiring, and light switch. If all these components are functional, consult a professional mechanic for further diagnosis.