How to check car fuses with a multimeter

Although it is easy to visually inspect the glass element of a fuse to see if it is blown, most fuses have solid, opaque bodies that hide the element from view. To check if a fuse is blown, we need a multimeter. Once set up, the multimeter can be used to measure the resistance of the fuse element. The resistance is measured in ohms ‘Ω’. A digital multimeter is used in the following instructions, but the same principles apply when using an analog multimeter (e.g., with needle display). If you are using an analog meter, read the tutorial first and then refer to the additional notes at the end.

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Connect the test leads.

The black wire should be connected to the common socket.

The red wire should be connected to the Ω or Ohm socket.

Not sure which fuse you need? We can help.Picture of the correct wire connection locations.

How do you set the ohms value on a multimeter?

Set the dial to the lowest range on the ohms scale (200 ohms is the lowest setting on this multimeter). This should also turn the meter on. If the meter has a separate power switch, turn it on. In the figure you can see that the ohmic range is represented by the light green bar in the lower left corner.

The 5 different ohmic range settings for this multimeter are;

2M = 2,000,000 ohms or 2 megohms (the highest resistance setting).

200k = 200,000 ohms

20k = 20,000 ohms

2k = 2,000 ohms

200 = 200 ohms (lowest resistance setting)

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To check if the multimeter is working

Bring the metal ends of the two test leads together and, while holding them together, the meter reading should change, indicating little or no resistance. Current simply flows from one lead to the other. If the two pins are disconnected, the meter reading will return to 100% resistance.

Measure the fuse.

This is important. Place the fuse on a non-conductive surface, such as wood, laminate or plastic. Touch the metal caps on both ends of the fuse with the metal ends of the test leads. There is no polarity, so you can use either wire for either fuse cap. Be sure to make good contact by touching the clean metal surface of each cap. While the wires are firmly connected to the fuse, observe the multimeter readings.

Note: If you want to test a fuse that is still in circuit. Be sure to turn the unit off and unplug it from the mains to avoid the possibility of electrocution.

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Understanding digital multimeter readings.

A fuse is OK: when the multimeter reading changes to a low resistance value (similar to the result when 2 wires come in contact).

The fuse is blown: if the reading does not change and the display still shows the original 100% resistance condition.

Remember to turn off the multimeter when you have finished the test.

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Picture of different meter readings

How to use an analog multimeter.

Analog multimeters take readings by moving a needle along a fixed scale. The testing process is exactly the same.

Select the appropriate resistance range and touch the metal ends of the test leads. The needle will “sweep” the scale, indicating little or no resistance. A good fuse will give the same reading.

When the leads are disconnected, the needle will indicate a 100% resistance condition. A blown fuse will give the same reading. Make sure that the ends of the test leads are securely connected to the metal covers or blades of the fuse and that the fuse is tested on a non-conductive surface.

Same day delivery for orders received before 14:00 hrs Australian Eastern Time.Photo of the original Swe-Check analog multimeter.

Can a car fuse break without blowing?

If your car fuse does not work and does not appear to be blown, there are several reasons why this may occur;

1. the fuse has a manufacturing defect. is it a high quality fuse or a cheap replacement?

2. the blown fuse was mistakenly replaced with a fuse of lower rating.

3. the device powered by the fuse is defective and draws more current.

4. the fuse is OK, but something went wrong during the test.

A car fuse does not usually fail due to overuse or aging. Automotive fuses are designed to last a long time if used within the parameters specified by the manufacturer.

The electrical circuits in modern vehicles are designed by qualified electrical engineers and rigorously tested under extreme conditions, so they are usually very reliable. In addition, automotive manufacturers use high quality fuses that are manufactured and tested to exacting standards. Want to know more about fuses? See all fuse tutorials.Car fuse box.

How can you tell if a car fuse has blown?

There are several ways to quickly check if a car fuse has blown. First, find the fuse that controls the malfunctioning device. The diagram may be on the fuse box cover or in the owner’s manual, or you can find it on the Internet. Next, use a fuse puller to remove the fuse; first, make sure the vehicle is completely off. Next, inspect the fuse for visual signs of discoloration or broken wires. You can then install a replacement automotive fuse.

Shop our selection of automotive fuses. Fuse box diagram.

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