Why Would Both My Headlight Go Out?

Whenever your headlights are out either totally or one at a time, it is mostly due to faulty components, such as its fuse, relay, or even the module, among several other reasons too. Wiring problems can also be behind the headlights failing to function partially or even completely too. In addition, your headlights can also refuse to work if you have a burnt light bulb, or even due to any problem with its high beam switch or relay. In such cases, all that may be required is to replace the spent bulb, switch, or relay, as the case may be.


In the rest of the article, you will find more details about having both headlights out day and also answers to other related questions.

What causes both vehicle headlights to go out?

Both your headlights can refuse to function at all due to a myriad of reasons. First of all, it can be as a result of a bad fuse, relay, switch, or faulty wiring. Secondly, the bulbs themselves might have got damaged or could be diminished in intensity due to prolonged use or age, such that they can no longer serve as required. In some rear situations, since most headlights are designed with a relay switch that supplies power to both the low and high beams, should this relay go bad, it may likely supply power to either the low or high beams but not both of them at the same time.

What happens if my headlights are out?

A lot of things can happen if your vehicle’s headlights are all out totally. To start with, you will not be able to see the road clearly under such conditions at night, particularly when it is very dark, as it happens sometimes. As a result, particularly since it is illegal to drive at night without headlights, you will be contravening the law for which you may be punished in any of several ways. This is because driving without headlights at night is tantamount to inviting avoidable accidents that can affect you, other road users, and the vehicles involved in the accidents.

Can I drive with both headlights out?

It is not advisable to drive with both headlights out since it is against the law in most places. Again, if you should do that, you risk getting into unnecessary accidents that may involve yourself, others, and the vehicles involved in the accidents. Furthermore, if you do so, since it is illegal, you can get punished by the law for doing it.

What to do if both the headlights are out?

The first thing you should do if your headlights are out is to promptly get them repaired whatever the cause may be. Replace all faulty components or fix any connection issues through a qualified auto technician closest to you. The following steps will certainly come in handy in such situations.

Step 1.

In the beginning, you should try to dimmer your light switch a few times just to be sure. Doing this may turn them back on again, in most common cases.

Step 2.

Next, if the effort above fails, you should try the headlight switch itself a few more times as well.

Step 3.

Finally, pull the car to the safe side of the road as soon as that is possible and leave your hazard lights on, so that other road users at the time can see your car clearly before you do all these things mentioned here.



Headlights are an absolute necessity especially from sunset to sunrise in most, if not all, parts of the world. Consequently, you are not allowed to drive without them at that time, and should you dare it, you have the law to contend with. Therefore, the first thing expected of you in this situation should be to get them fixed as soon as it is realistically possible. Luckily enough, this can be done at any auto electric workshop close to you, in a case where you cannot do it yourself.


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