How to Test a Fuse Without a Multimeter?

How to Test a Fuse Without a Multimeter?

It’s happened to all of us. We’re trying to fix something and we get stuck. We don’t have the right tool for the job. This can be frustrating, but it’s not the end of the world. In this blog post, we will show you how to test a fuse without a multimeter.

What is Fuse?

A fuse is a safety device that is used in electrical circuits to protect against an overload of current. Fuses are made of a thin wire that will melt and break when too much current flows through it, which will then stop the circuit from continuing to flow electricity.

Fuse is an important part of the electrical system and must be tested periodically to ensure that it is working properly and protects your electrical circuits [1].

The type of fuse that you need depends on the type of circuit that you have. Moreover, the fuse must be the correct size for the circuit that it is protecting.

What is Fuse?

Why Should You Test a Fuse?

  • One reason is to determine whether the fuse is blown and needs to be replaced. It’s also important to test a fuse to ensure that it’s not blown before you attempt to use an electrical device.
  • Another reason is to determine the amperage of the fuse. You need to know the amperage so that you can select a replacement fuse with the same or greater amperage rating.
  • One more reason to test a fuse is to determine whether it’s a slow-blow or fast-acting fuse. It plays a big role because it determines how much current the fuse can handle.
  • Finally, testing a fuse can help you diagnose an electrical problem. For example, if a device isn’t working, you can test the fuse and see if it’s blown. This will help you determine where the problem is and how to fix it.

As you can see, there are several reasons why you should test a fuse. It’s an important safety precaution and it can also help you diagnose electrical problems. So, the next time you have a problem with an electrical device, be sure to test the fuse. You may be able to solve the problem yourself!

What is a Multimeter?

A multimeter is an electronic instrument that can be used to measure voltage, current, and resistance. It can also be used to test electronic components, such as an ECU.

Multimeters come in a variety of shapes and sizes, but all of them have three basic parts: the meter itself, the probes, and the dial.

  • The meter is the rectangular part of the multimeter that displays the measurements.
  • The probes are the long, thin pieces that attach to the meter and are used to make contact with electrical components.
  • The dial is the knob on the front of the multimeter that sets the measurement range.

There are two types of multimeters: analog and digital. Analog multimeters use a needle to display the measurement, while digital multimeters use a series of digits.

What is a Multimeter?

Some multimeters also have additional features, such as capacitance measurement and frequency detection.

Multimeters can be purchased at most electronics stores or online. Prices vary, but they typically start at around $20.

Ways to Test the Fuse without a Multimeter

Maybe you don’t have a multimeter on hand, or maybe you’re just impatient and want to know if your fuse is blown now. There are a few ways to test a fuse without a multimeter [2].

The most popular of them are:

  • Swapping
  • Visual Inspection
  • Using a Fuse Tester
  • Using a Light Bulb
  • Continuity Tester
  • Ohms setting
  • Using a battery and some wire


The very first way to test a fuse is by swapping it with another fuse of the same rating. If the problem goes away, then you know that the fuse was bad. Be sure to test the old fuse for continuity after you’ve swapped it out to make sure it was really bad.

Swapping is the easiest and the quickest way to test a fuse, but it’s not always effective and accurate. If the problem doesn’t go away when you swap the fuses, then you’ll need to use a multimeter to test the fuse.

Moreover, it’s not always possible to swap out a fuse, especially if the fuse is hidden inside a device.

Visual Inspection

The second way to test a fuse is to visually inspect it. This can be done by looking at the fuse for any physical damage such as burns, cracks, or missing pieces. You can also check the color of the fuse to see if it’s burnt out. A blown fuse will have a blackened appearance.

Visual Inspection

You can also see if the fuse is blown by checking if it’s warm to the touch. A blown fuse will be warm, while a good fuse will be cool to the touch.

This method is not as accurate as using a multimeter, but it can be used as a quick and easy way to test a fuse. Moreover, it’s a good way to test fuses that are difficult to reach with a multimeter.

Using a Fuse Tester

The third way to test a fuse is to use a fuse tester. This is the easiest way to test a fuse, and it’s also the most accurate. A fuse tester will tell you whether or not a fuse is blown without having to remove it from the circuit.

To use a fuse tester, simply connect the two leads of the tester to the two terminals of the fuse. If the fuse is blown, the tester will light up or make a sound.

Then, simply replace the fuse with a new one and test it again. If the tester doesn’t light up or make a sound, then the fuse is good.

However, there is one disadvantage of using a fuse tester: it can only test fuses that are the same size as the one in the tester. So, if you need to test a fuse that is a different size, you’ll have to use one of the other methods.

Using a Light Bulb

The fourth way to test a fuse without a multimeter is by using a light bulb. This is a pretty simple way to test a fuse. To do this, you will need:

  • A light bulb
  • A pair of wire cutters
  • A pair of pliers
  • A screwdriver


  • Cut the wire about two inches from the end of the light bulb with the wire cutters.
  • Use the pliers to twist the wire off of the light bulb.
  • Remove the screwdriver from the end of the light bulb and discard it.
  • Strip about an inch of insulation from each end of the wire with the wire strippers.
  • Connect one end of the wire to one terminal on the fuse and the other end of the wire to the other terminal on the fuse.
  • If the fuse is good, the light bulb will light up.
  • If the fuse is bad, the light bulb will not light up.
  • Disconnect the wire from the terminals and discard it.
Warning: Be very careful when working with electricity. Do not touch the wires with your hands. If you are not sure what you are doing, please consult a professional.

Continuity Tester

Continuity Tester

The fifth option for testing a fuse without a multimeter is to use a continuity tester. This tool is specifically designed to test for continuity, or whether two points in an electrical circuit are connected.

To use it, first identify the two points you want to test. Touch the probes of the continuity tester to those points and then look at the tester’s display. If the tester beeps and the display shows a numerical value, that means there is continuity between the two points.

If the tester doesn’t beep or show a value, that means there is no continuity between the points.

This method is the most accurate way to test for continuity, but it’s also the most expensive. So if you’re on a budget, the other methods can still get the job done.

Continuity testers are available at electronics stores and online retailers like Prices start at around $15.00.

Using a battery and some wire

The sixth way to test a fuse without a multimeter is to use a battery and some wire.

You will need to remove the fuse from the circuit and then clip one end of the wire to the metal strip on the fuse. Next, connect the other end of the wire to the negative terminal on the battery. If there is continuity between the two terminals, the fuse is good. If there is no continuity, the fuse is bad.

You can also use this method to test for shorts in a circuit. Just clip one end of the wire to the negative terminal on the battery and touch the other end of the wire to each point in the circuit that you want to test. If there is continuity between any two points in the circuit, there is a short.

Check these guides to learn more about multimeters:


Can you test a fuse with a battery tester?

Testing a fuse with a battery tester is not recommended. A battery tester measures the voltage of a battery and cannot accurately test the current flow through a fuse. Instead, use a multimeter to test the fuse.

How do you fix a blown fuse?

If a fuse is blown, it will need to be replaced. To replace the blown fuse, locate the fuse box and remove the cover. The fuses will be located in a series of slots. Find the slot that has the same amperage rating as the fuse that was blown and replace it with a new fuse. Be sure to reattach the fuse box cover and test the fuse to make sure it is working properly.

Are screw-in fuses legal?

Yes, screw-in fuses are legal. However, they are not as common as blade fuses and may be harder to find in stores.

What is the difference between a fuse and a circuit breaker?

A fuse is a component of an electrical circuit that acts as a safeguard against overloads and short circuits. A circuit breaker is an electrical switch that is used to protect an electrical circuit from overloads and short circuits.

How often should you test your fuses?

There is no set frequency for testing fuses. However, it is a good idea to test your fuses every time you make any changes to your electrical system. This will help ensure that the fuse is functioning properly and protecting your circuit.

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Final Thoughts

Testing a fuse without a multimeter can be difficult, but it is possible. If you are careful and take your time, you should be able to test the fuse without any problems. Just make sure that you are aware of the risks involved and take precautions to avoid injury.

I hope this article was helpful. If you have any questions or comments, please let me know in the comments section below. Thanks for reading!