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Test a fuse

To check the correct operation of a fuse, the easiest way is to bring a multimeter. This device also called universal controller includes various electrical measuring tools such as a voltmeter, an ohmmeter, an ammeter or even others grouped into a single box.

Step 1: Prepare the multimeter

Start by connecting the multimeter cords to the controller terminals: the black wire on V and the red wire on COM.

How to test if a fuse works: fuse


Then set the selector to ohm x2000 or x200.
The multimeter's display should show the value 1.

How to test if a fuse works: multimeter

Step 2: Test the contact
Make the two ends of the contact points meet; the screen should now display zero. This tells us the continuity of the circuit.

How to test if a fuse works: multimeter

Step 3: Test the fuse
Put the contact points against both ends of the fuse.

How to test if a fuse works: multimeter


If the display shows 0, there is continuity in your circuit, your fuse is in working order.
If the display shows the value 1, there is no contact in the circuit, your fuse is blown.
Some fuses have control pellets that self-destruct when they jump, so they are easily identifiable.
Some fuses are equipped with wires, if the wires are melted, it is that the fuse is blown.
If your multimeter has a continuity tester function, it will advantageously replace the ohmmeter mode. The test will be the same, but the result will be a continuous beep if the fuse is good, and nothing else.


Video Instruction: How to Check a Fuse by Testing it with a Multimeter