What Happens When a Car Battery Fuse Blows?

by Phil Borges // in Car

So, you’ve been driving for a few hours, and your car battery fuse blows. What now? You are stranded on the road, and there’s no way to get home.

A car battery fuse can be a very frustrating thing to have to happen. There are so many reasons why this might occur, but the most common ones are that there is too much electrical load on the battery or that the alternator isn’t working correctly. This blog post will carefully identify the symptoms of a blown fuse and what you can do about it!

What happens when a car battery fuse blows?

If your car‘s electrical system is having problems, a blown fuse can cause some inconvenience. Like not being able to use your radio or losing turn signals. Though in rare cases, it might mean that you won’t be able to start the car at all since the battery will die out faster than usual.

A fuse is designed to protect your car’s electrical system from being overloaded by components that may become damaged and affect other parts of the system. It will blow if there is a surge of power that exceeds what it can handle or if it becomes too hot because of the amount of power. A blown fuse looks like two metal plates with strips of insulation between them, and you should change it right away to prevent damages to your vehicle’s electrical system.

What are the signs of a blown fuse?

A blown fuse may not seem like a serious problem, but it can cause excessive heat buildup in the system, leading to an engine fire. To avoid this, it’s important to recognize the signs of a blown fuse. These include:

  • Excessive heat buildup
  • Using every available accessory at the same time can cause a fuse to fail
  • Fuses may also blow because they have reached their expiration date
  • A fuse may blow if a faulty or higher-amp replacement has been used

It’s essential to diagnose the problem and make sure it’s just a blown fuse before taking your car in for professional repair.

What to do if my car battery fuse blows?

If your car battery fuse blows, you should get the battery checked to make sure that it is not faulty. If there is a problem with the battery, it may have caused the main battery fuse to blow, and you will need to replace it. You can also try replacing the fuse first, in case that is what caused the original problem.

Can I change a blown fuse in my car?

Changing a blown fuse in your car can be risky, and the process is pretty complex. If your battery has never been replaced before, or if you are not confident in handling this job, then it’s best to get a professional car mechanic to help with the job.

But, it is possible to change the blown fuse yourself if you are familiar with your car’s electrical system and what tools to use. It is done by locating the blown fuse, removing it, and replacing it with a new one. Be sure to change the fuse with the same amperage.

Can a bad battery cause fuses to blow?

It’s possible that a bad battery can cause fuses to blow, but it’s also possible that the problem is in your wiring. If you’re not sure what the issue is, it might be best to have an expert take a look at it.


The electrical system in your car is critical for the operation of all kinds of different systems. The battery and charging system will keep it running, but a blown fuse may still cause damage to other components if not replaced soon enough.

Check your fuses often for signs of wear and tear or damage. If any of the metal grates have cracked or broken away, then it’s time to replace it.

Make sure to let a qualified mechanic check out your battery if something seems off with it. They can also inspect the connectors between the wiring and other electronics if you think there may be an issue there.

If you don’t know or are not sure of how to properly change a fuse, or if the old one is melted shut, then it’s best to let an experienced mechanic handle it for you instead. They are trained and equipped with all the necessary tools as well.

If you have any questions about how to handle this situation, it is still recommended to consult with an expert who can help you maintain your vehicle’s battery health. Remember that neglecting such maintenance will only lead to more costly repairs down the line.

Back to top

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.