My Headlights Turn Off While Driving, What To Do Now?

Headlight technology hasn’t changed much in decades, and even newer technologies like adaptive lighting aren’t dazzling enough to draw attention. Here’s a scene for you to consider: Assume it’s a dark and gloomy evening. You finish your work, get in your car, and drive a few miles when you see that my headlights turn off while driving. What should I do now?

Why Headlights Might Turn Off While Driving?

Most of the headlight systems are simple, with just a few basic components such as bulbs, a relay, a fuse, and a switch. Daytime running lights, adaptive headlights, and other small aspects like fog lights are all variants of this basic theme, but the idea remains the same. That switch detects a relay when you switch on your headlights. That relay provides the electrical link between your headlight lights and the power source. Fuses are also used to control the rest of the wiring by acting as a donor failure point.

Your headlights will break if any of these elements cease working properly. You can typically return to find the ideal spot to start debugging by looking at how they failed. Below are some of the reasons why headlights turn off while driving

1. Wiring Issue

Your car’s wiring is complicated, and improper wiring could cause your headlights to stop working. Wiring issues could cause a fuse to blow, as fuses burn out when a system receives too much electricity. If the problem is only temporary, the fuse may only break once. The replaced fuse, however, will not endure if the problem is caused by an underlying wiring issue. Because of the complexity of your vehicle’s wiring, it’s best to leave the evaluation to the professionals.

2. Automatic Lighting

Although it may seem counterintuitive, automatic headlights are sometimes to blame for drivers failing to turn on their headlights. Knowing that the automobile has this feature can make a driver comfortable, especially if he or she is the type to switch everything off before leaving the vehicle to avoid inadvertent battery drain. When this motorist next gets into their vehicle, they may forget to return the headlight switch to “Auto.”

3. Expired Lightbulbs



If both sides of your headlights go out, you might not think burned-out bulbs are to blame. Even so, bulbs hardly burn out suddenly. It is, however, a more prevalent reason than you might believe. This is due to the fact that today’s headlights are bright. Because the other bulb is producing enough light, you may not notice that one has gone out. You won’t notice until the second one has burned out.

4. Instrument Panels With Lighting

Even if the headlights are turned off, most new cars include instrument panels that brighten when the engine is started. The headlight indication in contemporary automobiles is a little green icon on the display that is easy to overlook. Most cars from two decades ago, on the other hand, had dashboards that stay gloomy until the driver turned on the headlights. This made it simple for drivers to detect if their headlights were turned on or off.

What To Do If My Headlights Turn Off While Driving?

Things might quickly become perilous when your headlights turn off while driving. However, headlights can fail in both directions. Headlights that refuse to switch off, regardless of what you try, can quickly drain your battery and leave you stranded.

With this in mind, the best short-term remedy for headlights that won’t switch off is to take emergency precautions to avoid the battery from dying. This can be done in a number of ways:

  • Remove the battery connector.
  • Remove the fuse for the headlights.
  • Remove the relay for the headlights.

1. To Turn Off The Headlights, Remove The Fuse Or Relay

The proper fuse or relay can also be removed to turn off the headlights. Because you must first identify the relevant fuse panel and then determine which fuse or relay to remove, this is a little more difficult than simply removing the battery. However, this will prevent the computer and radio from losing power, so you won’t have to deal with any¬† consequences afterward

2. Replace The Light Bulb

If one of the headlights fails. Change the light bulb. If the problem persists, suspect a wiring or fuse issue. Other components of high-intensity discharge (HID) headlights can fail as well.

3. Make Sure You Have Power And Ground

If neither headlight works, check for power and ground, and fix it if necessary. Replace the bulbs if necessary. Although bulbs rarely burn out at the same time, it’s still vital to rule out the possibility by checking for power. A defective component, such as a fuse, relay, or module, is the most common reason for total headlamp failure. Both headlights may stop operating due to wiring issues.

4. Lenses Should Be Cleaned

If your headlights are working but are dim, Replace the bulbs, clean the lenses, or fix the charging system. Foggy lenses or worn-out bulbs could be to blame if your headlights are always dim. If your headlights dim under specific conditions, there could be a problem with your charging system.


Frequently Asked Questions-

Here are some frequently asked concerns concerning headlights turning off while driving.

1. How Can I Tell If My Headlight Relay Is Malfunctioning?

Headlights that don’t operate are the most prevalent indicator of a faulty headlight relay. In the open position, a headlight relay will often fail, preventing voltage from reaching the headlights. The low beams will not work if the low beam relay fails.

2. What Should You Do If Your Headlights Suddenly Stop Working?

If your headlights go out unexpectedly, take the following steps:

  • To begin, check your dimmer switch. This frequently turns them back on.
  • Several times, try the headlight switch.
  • Pullover to the side of the road as quickly as possible and turn on your hazard lights so that other drivers can see you.

3. When Driving, What Causes Headlights To Turn On And Off?

The lights going off and on that you describe are frequently caused by the headlight bulbs overloading the circuit breaker included in the headlight switch. I would consider replacing the headlight bulbs with factory-approved bulbs, and then replacing the headlight switch if the problem persists.

4. For Headlights, What Fuse Should I Use?

A standard headlight’s average high beam is 55 or 65 watts. That’s less than 6 amps nominally in a 12 V circuit. You should be fine if you use a 10 amp fuse.


During driving, the vehicle’s automatic headlamp management system, which is based on a transistor and uses an ambient light sensor, is focused on giving the driver a comfortable driving experience as well as ensuring the safety of the passengers on the road. This is accomplished by adjusting the headlight intensity to match the ambient light intensity using a photo-transistor-based ambient light sensor.

It can be installed in the vehicle’s body where the sensor can easily detect ambient light, such as the rear glass side. This is useful for drivers who don’t pay attention to the intensity of their headlights and their headlights turn off while driving. At the same time that the battery power usage is optimized, safety is ensured. This is especially effective at night or in dim light.

Leave a Comment