Tips Sahabat

5 Causes of Car High Beam Not Working

10 April 2025
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Car headlights for long-distance illumination are often needed in emergencies, such as requesting the right of way or signaling that you are traveling at high speed. 

Therefore, they must be maintained by knowing some causes of car high beams not working. This way, you can fix the problem without having to go to a workshop.

1. Blown Fuse

A common condition is when the high beam is completely dead and cannot be used in critical situations. This is usually caused by a blown fuse that cannot conduct electrical current. 

You can check it by looking at the black box located at the front, specifically near the steering wheel. The number of these black boxes varies in each car, such as two or even four. 

Most four-wheeled vehicles in Indonesia have two fuses for the headlights on the left and right sides. This way, you can check them one by one to determine where the problem lies.

2. Relay

Another common cause is a relay wire that does not function properly even though the car is running. This cause of the car's high beam not working is indicated by the light being able to turn on when the wire is shaken. 

If this condition occurs, it can be resolved by replacing the connecting wire inside the relay. You can take an unused wire to connect the light and the power source inside the car. 

Make sure this wire is in good condition so that it can be used in emergencies like this. However, the driver should immediately take the car to the nearest workshop so that the relay wire can be replaced with a quality one.

Read also: 5 Steps to Make Your Headlights Look New Again

3. Bulb

A dead high beam can also be caused by a burnt-out bulb. This can be due to improper bulb installation or because the bulb glass is dirty. 

Make sure the bulb is installed according to the specifications and should not be touched by hands to keep the bulb glass clean. In addition to proper installation, the quality of the bulb chosen is also a determining factor for whether it lights up or not. 

This cause of the car's high beam not working can be anticipated by choosing a high-quality bulb. This way, it can withstand heat so that the filament inside can last longer than other brands of bulbs.

4. Voltage

One way to maintain car high beams is to have an electrical system with stable voltage. You can measure it using a voltmeter or multimeter for more accurate measurements. 

Avoid excessively high voltage or sudden spikes so that the lights do not easily burn out. What is worse and often unnoticed by the owners of four-wheeled vehicles is that the car lights can go out simultaneously. 

Drastic fluctuations in voltage cause the lights to overheat, leading to filament breakage. This cause of the car's high beam not working means you have to replace the entire bulb.

Driving on the road requires high beams, both day and night. You need some code for other drivers to give space in certain conditions. If this light goes out, it can be quite dangerous if you are driving at high speed, especially at night.  

Read also: Understanding the Function of Hazard Lights and How to Use Them

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