Brake lights not working but the third light is still functional? This is a common issue many drivers face.
It can be confusing and potentially dangerous. When brake lights fail but the third brake light works, it indicates an electrical problem. The third brake light, also known as the center high mount stop lamp, is often wired separately. This separation helps in diagnosing the issue.
Knowing the difference between regular brake lights and the third light can aid in troubleshooting. In this blog, we will explore possible causes and solutions. Understanding these can help ensure safety on the road. Let’s dive into the details and fix this problem together.
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Common Causes
Brake lights not working but the third light is can be confusing. Several factors could cause this issue. This section will explore some common causes behind this problem.
Burnt Out Bulbs
The most common cause is burnt out bulbs. When brake light bulbs burn out, they stop working. The third brake light uses a different bulb. So, it may still work even if the main brake lights fail.
- Check each brake light bulb.
- Replace any burnt out bulbs.
It’s a simple fix. Most people can do it themselves. Consult your vehicle’s manual for bulb types.
Blown Fuses
Blown fuses can also cause brake lights to stop working. Each vehicle has a fuse box. It contains fuses for various electrical components.
- Locate the fuse box in your vehicle.
- Check the fuse for brake lights.
- Replace any blown fuses.
Fuses are cheap and easy to replace. Make sure to use the correct fuse rating.
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Diagnosing The Issue
Diagnosing why your brake lights are not working can be tricky. Especially if the third brake light still functions. This guide will help you identify the issue step-by-step. Follow along to ensure you diagnose it correctly.
Tools Needed
Before you start, gather the necessary tools. You will need:
- A multimeter
- Screwdrivers
- Replacement fuses
- Wire tester
- Electrical tape
Step-by-step Guide
Now, let’s begin the diagnostic process.
Step 1: Check the brake light bulbs. Remove the bulb cover and inspect the filaments. If broken, replace the bulbs.
Step 2: Inspect the fuse box. Locate the brake light fuse. If blown, replace it with a new fuse.
Step 3: Test the brake light switch. This is near the brake pedal. Use a multimeter to check for continuity. If faulty, replace the switch.
Step 4: Examine the wiring. Look for any damaged wires. If found, use electrical tape to secure them. Replace wires if necessary.
Step 5: Check the relay. Some vehicles have a brake light relay. Consult your manual to find and test it. Replace if needed.
By following these steps, you can diagnose why the brake lights are not working. Remember to always stay safe and consult a professional if unsure.
Checking The Bulbs
When your brake lights are not working but the third light is, the issue might be with the bulbs. This problem can often be fixed by checking the bulbs. Below are some steps to help you with this process.
Removing The Bulb
First, locate the brake light housing. Use a screwdriver to remove the screws holding it in place. Carefully pull the housing out and locate the bulb. Twist the bulb socket counterclockwise to remove it. Gently pull the bulb out of the socket.
Inspecting The Filament
Once the bulb is out, inspect the filament inside the glass. Look for broken or burnt filaments. A broken filament means the bulb needs replacement. If the filament looks intact, the issue might be elsewhere.
Check for any corrosion on the metal parts of the bulb. Clean any dirt or rust using a wire brush. Ensure the socket is clean and free of debris. Insert a new bulb if the old one is damaged.
Inspecting The Fuse
Brake lights not working but the third light is on can be confusing. The problem might be with the fuse. Inspecting the fuse can help you find the issue. This section will guide you through the process.
Locating The Fuse Box
First, you need to find the fuse box. In most cars, the fuse box is under the dashboard or in the engine bay. Check your car’s manual to find the exact location.
| Car Model | Fuse Box Location |
|---|---|
| Sedan | Under the dashboard |
| SUV | Engine bay |
| Truck | Near the glove box |
Testing The Fuse
Once you find the fuse box, you need to test the fuse. Look for the brake light fuse. The car manual can help you identify it.
- Turn off your car.
- Use a fuse puller or needle-nose pliers to remove the fuse.
- Check if the fuse wire is broken.
If the wire is broken, the fuse is blown. Replace the blown fuse with a new one of the same rating. This should fix the brake light issue.
If the fuse is not blown, the problem might be elsewhere. It could be a wiring issue or a faulty brake light switch.
Evaluating The Brake Light Switch
When your brake lights don’t work but the third light does, the problem could be with the brake light switch. This small part plays a big role. It sends a signal when you press the brake pedal. Let’s explore how to check it.
Identifying The Switch
The brake light switch is near the brake pedal. To find it, look under the dashboard. The switch is a small device attached to the pedal arm. It usually has two wires connected to it. Knowing its location makes the next steps easier.
Testing The Switch
First, you need a multimeter. This tool measures electrical current. Set it to the voltage setting. Press the brake pedal and check the switch. The multimeter should show a reading. No reading means the switch is faulty. Replace it for your brake lights to work.
Another way to test is by using a jumper wire. Connect the two terminals of the switch. If the brake lights come on, the switch is bad. This simple test can save you time and money.
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Examining The Wiring
When your brake lights stop working, but the third light is on, the wiring may be the issue. Wires carry electricity to the lights. So, a problem in the wiring can cause brake lights to fail. Check the wiring thoroughly. This will help to find and fix the problem.
Visual Inspection
Start by looking at the wires. Examine them closely. You may find broken, frayed, or burnt wires. These can cause the brake lights to fail. Look for loose connections. Wires should be securely connected. Check the fuse box too. A blown fuse can be the culprit. Replace any damaged fuse you find.
Using A Multimeter
A multimeter can help test the wires. It measures electrical current. Set the multimeter to the correct setting. Touch the probes to the wire ends. The multimeter will show if current flows. If no current flows, the wire may be faulty. Replace any bad wires. This can restore your brake lights.
Replacing Faulty Components
Brake lights are essential for safe driving. If the brake lights are not working but the third light is, you might need to replace some components. This guide will walk you through the process of replacing faulty parts to get your brake lights working again.
Bulb Replacement
First, check the brake light bulbs. A blown bulb is a common reason for brake light failure. Open the trunk or rear hatch to access the brake light housing. Remove the screws or clips holding the housing. Pull out the old bulb carefully. Insert a new bulb of the correct type. Test the brake lights to ensure they are working.
Fuse Replacement
Next, check the brake light fuse. A blown fuse can cause brake lights to stop working. Locate the fuse box in your car. Refer to the car manual to find the brake light fuse. Remove the fuse using a fuse puller. Inspect the fuse to see if it is blown. Replace it with a fuse of the same rating. Check the brake lights again.
Preventative Maintenance
Brake lights are crucial for safe driving. If the brake lights fail but the third light works, it can be confusing. Preventative maintenance can help avoid this issue. Regular care keeps your brake lights in good condition.
Regular Inspections
Check your brake lights every month. Turn on your car and press the brake pedal. Have someone check if the lights are working. If you see any issues, fix them quickly. This simple step can prevent bigger problems.
Regular inspections can catch small issues early. Look for loose wires or broken bulbs. These can be easy fixes. It is better to handle them now than wait for a complete failure. Consistent checks will keep you safe on the road.
Keeping Spare Parts
Having spare parts on hand is smart. Keep extra bulbs and fuses in your car. If a light goes out, you can fix it right away. This saves time and keeps you from driving with a broken light.
Spare parts are not expensive. You can find them at auto stores. Keeping them in your car takes little space. But it can make a big difference in an emergency. Be prepared for any situation.
Frequently Asked Questions
Why Are My Brake Lights Not Working But The Third Light Is?
The main brake light circuit might be faulty. Check for blown fuses or bad wiring.
How Can I Fix Brake Lights Not Working?
First, inspect the brake light switch and wiring. Replace any damaged parts.
Could A Blown Fuse Cause Brake Lights To Fail?
Yes, a blown fuse can prevent brake lights from working. Replace the fuse to resolve the issue.
Is It Safe To Drive With Only The Third Brake Light Working?
No, it is not safe. Fix the main brake lights immediately for safety.
Can A Bad Brake Light Switch Affect Only The Main Lights?
Yes, a faulty brake light switch can cause main brake lights to fail. Replace it if necessary.
Conclusion
Fixing brake lights can seem tricky, but it’s important for safety. Start by checking the fuse and bulbs. Don’t forget the brake light switch. Look at wiring for any damage. If unsure, consult a mechanic. Regular checks can prevent these issues.
Keeping your brake lights working ensures safe driving. Stay proactive, stay safe.