Why Does My Headlight Keep Going Out

This article talks about possible reasons your headlights keep going out. 

If your car’s headlights keep going out, or if they flicker periodically, there are a couple reasons as to why. But whatever the case, headlights that keep going out pose a serious safety risk and need to be fixed at the earliest. 

Some common causes of headlights that keep going out include improper installation, a blown fuse, and faulty wiring. There are also other reasons your headlights keep going out, as we’ll talk about below. 

We will also recommend how to diagnose and address these problems, so that you can prevent your headlights from going out. 

We’ve been working on and testing headlights for over a decade. So if you’re scratching your head trying to figure out why your headlights keep going out, allow us to help. 

Keep reading for more information on why your headlights keep going out. 

Reasons Your Headlights Keep Going Out

Here are just a few possible reasons why your headlights keep going out. 

Improper Installation

If you recently got your headlight bulbs replaced and started noticing them flickering or going out all the time, it could be because they weren’t installed correctly. This could mean that the bulbs didn’t fit into the socket properly, or that the bulb size wasn’t the right one.

Blown Fuse

Blown fuses can make your headlights go out. There are two common reasons for blown fuses. 

It is possible that the fuse was not replaced properly. If the fuse that was fitted to your car has higher amperage, it would blow out. Consult the vehicle owner’s manual to figure out what kind of fuse you need and replace it. 

Short circuits are another cause for blown fuses. The short circuit could be due to frayed wiring insulation, a malfunctioning voltmeter, or a bad conductor in the car’s electrical system. If this is the case, you might have to go through the entire electrical system to find the culprit, starting with the alternator and the battery. 

Excess Condensation 

If your headlights keep going out, it might be due to the condensation buildup inside the headlight assembly. It is common for condensation to build up in the headlight, and in extreme cases, it can cause problems with the headlight bulb and the electrical system of your car. 

Extreme Temperature

This is less common, but extreme temperatures can also cause your headlights to go out. For example, extremely cold weather can cause the headlight bulb filaments to become brittle and even break. 

How To Prevent Your Headlights From Going Out 

There are a couple things you can try to prevent your headlights from going out again and again. 

Ensure proper fitment of bulbs 

Make sure that the headlight bulbs are properly fitted inside the headlight assembly. This involves making sure you have the correct size bulbs, that they fit into the sockets properly, and that there are no loose connections or wires in the headlight unit. 

Replace fuses 

Check to see if there are any blown fuses in your car, and replace them. It is also a good idea to find the cause for the blown fuse, and address that quickly so that it doesn’t happen again. 

Remove condensation from the headlight assembly

If you notice condensation building up in the headlight, remove it before the water has a chance to mess up your car’s electrical system and possibly cause the headlights to go out. If you’re not sure how to go get the condensation out of your headlight, we’ve made a handy guide that you can check out. 

Avoid extremely cold temperatures

This might seem like a stretch, especially for people living in very cold weather, but if all else fails, you can try parking your car indoors, or at the very least, away from direct exposure to extremely cold weather.

How To Make Sure Your Headlights Are Working Properly

With all of the above sorted, there are a couple other things you need to make sure of before riding off. 

Check Your Headlight’s Calibration

Perfect beam pattern is an absolute must when it comes to car headlights. If the headlights are not properly calibrated, you could experience a dim or blurred beam, and the angle of vision will not be optimal. 

Check to see if your headlights are properly calibrated, so that you get the optimal experience. 

Make Sure The Automatic Headlight Sensors Work Properly

If you have a newer car, it likely comes with headlight sensors that automatically turn the headlights on when it gets dark. 

It is important to make sure that these sensors work properly, or they could turn the headlights on during the day. This in turn can reduce the lifespan of the headlights, or even cause the bulbs to blow out due to the extra load.

Have A Professional Do A Checkup Of Your Car’s Electrical System

Your car’s electrical system might as well be dark magic, what with how complicated and hard to navigate it can be!

If you want to prevent your headlights from going out or experiencing problems, it might be a good idea to have a professional who understands it take a look and diagnose any problems before they become really concerning. 


To sum up, if your headlight bulbs keep going out, it could be due to a number of reasons. It could be a problem with your car’s electrical system, faulty bulb installation, blown fuses, or even the weather! 

But there’s an easy fix to all of these problems, and there are a lot of preventative measures you can take to keep your headlights from going out. 

It is also important to make sure that your headlights are properly calibrated, any sensors work as they should, and that there are no major problems with the electrical system that could cause even more issues down the line. 

And lastly, if you need a good recommendation for the type of bulb you should buy for your car, give one of our buying guides a look. 

Check out our most popular pages to find the best headlight bulbs.

Check out the brightest headlight bulbs as well.

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Richard Nickleson is the author and owner behind Headlight Reviews. He first started the site as a hobby to share his insights on car parts and specifically headlight bulbs, but it soon ballooned and now he writes on all topics surrounding headlights bulbs. If you've got a bulb question, contact Richard here.