fuse keeps blowing in car

Why Fuse Keeps Blowing in Car? (Update 2019)

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Automotive or car fuses are security devices that are made of wire strips that would melt and break the electric circuit if the current would overpass a safe level. They are used to guard and protect electrical equipment in vehicles.

All cars have fuse boxes hidden somewhere in the driver’s cabin. In most of the cases, these fuse boxes would be placed somewhere near your feet, under your car’s steering column, or someplace like the box for the gloves or so

If you blow a fuse, you will know for sure. Everything will stop working on the circuit in the matter if that happens. Everything at all, for example, radios, lights, and side mirrors, etc.

Sometimes you will blow the same fuse several times, and there are several reasons for that.

Now, let’s give a look at why might the fuse keeps blowing in car.

What Causes Fuse Keeps Blowing in Car

As we mentioned, there are several reasons to why the fuse in your car can blow. However, the number one reason would be inside amplifier faults due to the short to ground power supply line.

But, you will need to track down the very source of your problem to be able to solve it. So here are basic diagnostic steps:

good fuse vs bad fuse

  • Locate the fuse that has blown;
  • Replace the fuse that has blown when you have turned everything off;
  • If the fuse keeps blowing when everything is turned off, there might be a short somewhere between the fuse and the rest of your car’s system;
  • Replace your fuse once again with the amplifier that you have previously disconnected;
  • If your fuse still keeps blowing, there must be a short in the wiring somewhere.
  • If that fuse stops blowing with everything off, but it blows when the amplifier is turned on, there just might be an amplifier related internal problem.

Fuse Is In The Wrong Amperage Rating

Something that is very obvious, but that happens quite often is that the fuse is in the wrong amperage rating. Please, make sure to check that. Drivers manual would normally have a diagram in which you can find this information.

The new amplifier can sometimes take too much of the power, and that would be the reason for the fuse blowing. Give another quick look to the device on the circuit in the matter. Naturally, more devices you have, bigger the drag.

Every device that uses electricity needs a certain amount of amperes. Those devices can be anything from radios to headlights, and they are draining your car’s electrical system.

Every fuse should have a number on it, and that number shows the number of amperes that can be tugged through it before it completely blows.

Now, every wire in the car has its thickness and the very kind of conductors in the wires will determine what power those can take before they melt from overheating. Same boundaries stand for any electric device.

Fuses are there to protect both devices and wires in your car.

Diagnosing an Electrical Short

The short circuit or simply “the short” is just the connection of low resistance between any two conductors that are used to supply electricity to a circuit. There are a few reasons to having the short circuit in your car. We are going to mention the three most typical ones.

Starting from the most common cause, these reasons would be as follows:

1. Electrical device failed

This is the most usual one, and it happens quite often, so pay double attention to it. If some of your devices have died, fried, or melted inside, they might just start taking up too much energy while trying to still stay working.

This just sounds exhausting. And it is for your car. This will in most of the cases overburden your circuit, and it would cause the short and your car’s fuse will blow.

2. Frictions versus a wiring installations cause the wire isolation to wear off

This is another cause that is very common, so remember it well and keep an eye on it. The exposed wires may cause the short circuit if they touch the ground surface. That can often cause the sporadic short circuits.

When the wires move, they may sometimes get in touch with the top layer of a surface that can cause the short circuit and therefore, a fuse to blow.

3. Any of the connectors that gets uncovered to any element may cause short circuit

You will need to pay attention to everything that can cause this, even though this cause is the least common one. You can have a leak somewhere in your car, your carpet can get wet, and that can cause wet wire installation; that is not very good to have around.

Wet wire installations can rot over time, and that can provoke a final short circuit or a lot of fuses that often blow.

I have blown a fuse

blown fuse problem

via: https://carfromjapan.com/article/car-maintenance/replace-blown-fuse-in-car/

You might as well wonder what you should do if you blow a fuse.

Well, the first thing that you will have to do is consult the manual. We already mentioned where the fuse box might be, but it should appear in owner’s manual anyway.

You should be able to remove the lid very easily, with your bare hands, or you might need a screwdriver, or pliers, or some other type of tool that you would probably have in your garage. Just replace a blown fuse; you will know what the one that needs replacing is. They are usually very cheap, and you can get them anywhere that you are usually buying your car parts.


If we take in the account everything that we have mentioned, we can conclude that there a several rather common reasons to your fuse that keeps blowing.

However changing the blown fuse easy can be, there is not a reason to just forget and let it happen. So we advise you to keep in mind all of the causes that we have covered in this article and give a look or two at your installations from time to time.

It will surely keep you from unneeded trouble.

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