Replacing the third brake light on a Jeep Wrangler is a simple task, but it’s also an important one for safety and legal reasons. The third brake light, also called the center high mount stop lamp (CHMSL), helps drivers behind you notice when you’re stopping—especially if your main brake lights are blocked by a spare tire or cargo. Many Wrangler owners upgrade or replace this light when it burns out, gets damaged, or if they swap to a larger spare tire setup. Even beginners can handle this DIY project with basic tools and a little care.
When Should You Replace The Third Brake Light?
There are a few signs your third brake light may need replacement:
- The light does not turn on when braking.
- The lens is cracked or full of moisture.
- You’ve upgraded to a larger spare tire that blocks the stock light.
- You want a brighter or LED version for better visibility.
According to National Highway Traffic Safety Administration data, working third brake lights reduce rear-end collisions by up to 23%. That’s a strong reason to keep yours in top condition.
Tools And Parts Needed
Gather everything before you start:
- New third brake light assembly (check if you need an LED or standard bulb)
- Phillips and flathead screwdrivers
- Socket wrench set (usually 13mm or 15mm)
- Electrical tape (if needed)
- Clean cloth
Some Wrangler models (like the JL and JK) have slightly different designs. Always check your owner’s manual or match your new part to your Jeep’s year and model.
Step-by-step Guide: Replacing The Third Brake Light
1. Disconnect The Battery
Always start by disconnecting the negative terminal from your Jeep’s battery. This prevents any short circuits while working with the wiring.
2. Remove The Spare Tire
Most Wrangler third brake lights are mounted behind or above the spare tire. Use your socket wrench to remove the lug nuts and carefully take off the tire.
3. Unscrew The Brake Light Assembly
Locate the screws or bolts holding the brake light to the tire carrier. Most Wranglers use 2 or 3 Phillips screws. Remove them and gently pull the light away.
4. Disconnect The Wiring
You’ll see a wiring connector at the back of the light. Press the tab and unplug it. If you notice corrosion or dirt, clean the connector with a cloth before installing the new light.
5. Install The New Light
Plug the wiring into your new brake light. If you’re upgrading to an LED light, check if a resistor or adapter is needed for your Jeep model (refer to the product instructions).
6. Secure The New Light
Align the new assembly on the tire carrier and screw it back in place. Make sure it’s tight, but don’t over-torque and risk cracking the plastic.
7. Reinstall The Spare Tire
Mount the spare tire back onto the carrier, tightening the lug nuts in a crisscross pattern for safety.
8. Reconnect The Battery And Test
Reconnect your Jeep’s battery, then press the brake pedal and check that the new third brake light works correctly.
Comparing Jeep Wrangler Third Brake Light Types
Choosing the right replacement can be confusing. Here’s a simple comparison:
| Type | Brightness | Lifespan | Cost | Compatibility |
|---|---|---|---|---|
| Halogen | Standard | 2-4 years | Low | Most stock models |
| LED | High | 5-10 years | Medium | JK, JL, aftermarket |
| Custom/Relocation Kits | Varies | 5-10 years | High | Oversize spare tires |
LED third brake lights are a popular upgrade. They use less power, shine brighter, and last longer than stock halogen bulbs.
Common Mistakes To Avoid
Many beginners rush the job or skip steps. Here are mistakes you can avoid:
- Forgetting to disconnect the battery: This can cause electrical shorts.
- Not cleaning connectors: Dirt or corrosion can lead to weak or flickering lights.
- Over-tightening screws: You can crack the plastic housing.
- Choosing the wrong part: Wrangler JK, JL, and TJ models use different third brake lights.
- Not checking brightness/legal rules: Some aftermarket lights are too dim or too bright for road use.
Real-world Example: Wrangler Jk Vs Jl Light Replacement
To show the differences, here’s a comparison between JK and JL models:
| Model | Year Range | Mounting Position | Wiring Type |
|---|---|---|---|
| JK | 2007-2018 | On spare tire carrier | Single plug |
| JL | 2018-Present | Above spare tire, integrated | Multi-pin plug |
Notice that newer JL models often need a different wiring approach and may have more complex connectors.
Two Key Tips Most Beginners Miss
- Test the new light before full reassembly: After plugging in the new light, press the brake pedal (or ask someone to) before you put the spare tire back. This saves you from repeating steps if there’s a problem.
- Check local laws: Some states require the third brake light to be visible above a certain height or brightness. If you use a custom or relocated setup, make sure it’s legal for street use.
Maintenance Advice
Once your new third brake light is installed, keep it clean and check it during regular oil changes. A dirty or blocked lens reduces visibility—a quick wipe makes a big difference.
If you notice flickering or dimness, check the wiring for corrosion. Many Jeep owners drive off-road, and mud or water can get into the connectors over time.
For more official details, you can visit the Wikipedia Center High-Mounted Stop Lamp page.
Frequently Asked Questions
How Long Does It Take To Replace The Third Brake Light On A Jeep Wrangler?
Most people can finish this job in 20 to 30 minutes if they have the right tools and replacement part ready.
Do I Need To Buy A Special Tool To Change The Third Brake Light?
No special tools are needed—just a screwdriver and a socket wrench. Always check your Jeep’s manual for any model-specific advice.
Is It Legal To Drive Without A Third Brake Light?
It is illegal in most US states to drive without a working third brake light. Police can ticket you, and it may cause your vehicle to fail inspection.
Can I Replace A Halogen Third Brake Light With An Led One?
Yes, but check for compatibility. Some LED lights need a resistor or adapter to prevent error messages or flickering.
What Should I Do If My New Light Doesn’t Work After Installation?
First, check the wiring connector for loose pins or dirt. If everything looks correct, try reconnecting the battery or test the new light with a 12V power source to confirm it’s not defective.
Replacing the third brake light on your Jeep Wrangler is a quick upgrade that boosts safety and keeps your Jeep road-legal. With a little care and the right approach, you’ll be back on the road in no time.
