Updated at: 13-03-2022 - By: micdot

Every part of your car is essential. That’s why it’s so important to keep an eye on the condition of your car’s components. One of the most critical components of your car when it comes to night driving is the lighting system. So, let’s talk about your vehicle’s brake lights and headlights now. If you’re traveling at night, make sure your brake lights and headlights are on. It’s dangerous to drive at night if you don’t have working brake lights.

There is a risk of a tragic collision if other vehicles do not see your approach. Make it a habit to always check all of your lights before driving your car, even if the brake light is located in a hard-to-see place. As a result, you should be aware of the critical nature of your brake lights. Brake lights may not be working for you as a driver at one point or another. More interesting is that your headlights are working, but you have a problem with your stop light. In the meantime, let’s discuss this issue.

What Causes That Brake Light Doesn’t Work When Headlights Are On?

Brake lights may not be working, but headlights are. You may be unsure of what is going on. Having a problem with simply your brake lights can be an odd one. The first thing we need to discuss is why this is happening. It is possible that your brake lights are not working, but your headlights are still on.

1. You Might Have A Problem With Your Electrical Ground

There may be a problem with your brake light switch, which could lead to a poor electrical ground, if your brake light isn’t working. Damage to the wire ends may be the cause of an inadequate electrical ground. A loose connection or rusty wires can also be the cause of the problem. Using a jumper wire, you can verify that the connection between your light switch and a good ground is correct. Then, you must apply the brakes.

Brake lights may indicate an issue with your electrical ground if they work. It’s time to fix the ground connection.

2. You Might Have A Problem With Your Light Switch And Fuse Box

Your light switch and fuse box may be faulty. You must first find your vehicle’s fuse box or power distribution center (PDC). You may find the PDC or the power distribution center in the engine compartment. Under the dashboard, you’ll find the fuse panel. In addition, the brake light switch is located under the dashboard of your vehicle. You need to make sure that the plunger doesn’t get in the way of the brake pedal.

Brake lights can be affected if your fuse or switch box is malfunctioning. In addition, see if a fuse has blown in the circuit. The only way to fix it is to buy a new one. The type of replacement you choose should be the same as the one that blew. If you’ve replaced all of the fuses, it’s also important to know why one blew. Keep it from happening again by solving the problem.

3. You Might Have A Problem With Your Turn Signal Switch

Some automobiles have brake lights that are also part of the turn signal circuit. Brake lights may not work properly if the switch is broken in this way. As a result, you’ll need to inspect the switch diagram’s wiring for damage.

4. You Might Have A Problem With Your Light Bulbs

When your brake lights don’t work, but your headlights do, this is a common cause. The bulbs in your house may have burned out. If only the other lights are out, but your brake light doesn’t function, try replacing the bulbs. Take the screws out of the bulb lens to check it. Through the trunk, you’ll be able to find and access the bulb lens. Check your vehicle’s repair handbook or owner’s manual if you need help locating the bulb lens.

Once you’ve found it, you’ll need to push the bulbs and counterclockwise turn them. This will remove it from the socket. It’s imperative that you replace any blown or darkened light bulbs with new ones. You must use the same type of light bulbs every time you replace them.

5. You Might Have A Problem With Your Wiring

Wiring problems might cause faulty brake lights to fail. You should inspect the brake light switch and fuse panel for loose or damaged wires. The wires that link the switch to the bulb sockets must also be checked.

Corrosion of the wires should also be checked. It’s possible that you’ll need to fix or replace parts in these areas if you discover any issues.

How To Fix This Problem?

The tail light assembly must be removed in order to perform the necessary repairs. After that, take the wiring harness out of service. Pulling apart the male connector can be done by sliding a red locking clip to its right-hand side. Put the tail assembly on a bench if you’ve removed it from your car. If you’re using a taillight, remove the socket.

There are three silver contact points inside the black plastic ring. There’s a link between them, and one is on the other side. The brake and tail light contacts are the only ones above ground. The ground connection may be faulty. You must next thoroughly clean all of the contacts.

Why Won’t My Tail Lights Work When My Headlights Are On?

If your tail lights don’t function when your headlights are on, you may not know what to do. This could also be due to a number of other factors. Separate wiring connects the vehicle’s headlights and taillights. It’s fine if one of them is now employed while the other is not. You may have electrical problems or faulty wiring to blame for this issue. Fuse and bulb failures can also be to blame.

If you’re experiencing this issue, look into the possible causes. If you’re still stumped, talk to a professional or a mechanic.


A car wouldn’t be complete without brake lights and headlights. It’s a must-have, especially if you’re doing any nighttime driving. Brake lights can malfunction from time to time. You need to find the root problem as soon as possible. Do not drive at night without your lights until it has been repaired.