In a car, the fuse is a device that is used to protect the electrical circuits from overloads. The fuse is placed in between the battery and the electrical system and it acts as a safety switch that will cut off the flow of electric current if there is too much current flowing through the circuit.
If you’re like most people, you probably don’t know how to check a fuse without removing it. Don’t worry, it’s actually quite simple. All you need is a multimeter. With a multimeter, you can easily check to see if a fuse is blown without having to remove it from the fusebox. Just follow these simple steps and you’ll be checking fuses like a pro in no time.
How To Check Fuses Without Removing Them
Method 1. Testing A Fuse Without Removing Them Measuring The Voltage
This is another method of testing a car fuse with a multimeter. In this method, you will learn how to test the car fuse without removing them from the fuse box.
In this testing method, voltage is measured in both terminals of the fuse with a multimeter without pulling them out of the fusebox. If the voltage is measured in both terminals of the fuse then the fuse is good and if the voltage is measured in one terminal of the fuse, not in another terminal then the fuse has blown.
Step 1. Move The Dial To DC Volt Mode
Grab the multimeter and move the selector to 20-volt DC mode and put the black lead in the common socket and the red lead in the Voltage socket.
Step 2. Turn ON The Suspected Fuse’s Circuit
Turn ON the suspected fuse’s circuit. So that the electrical current starts to flow in the circuit, and voltage is measured across the fuse using a digital voltmeter.
Step 3. Check The Fuse
Place the tips of both leads on the fuse of both terminals and look at the display of the voltmeter. You will see zero or near-zero voltage, which means the fuse is good. If the voltage across the fuse is the full supply voltage, it means the fuse has blown. Need replacement.
Method 2. Testing The Fuse With Multimeter Using Body Frame Method
You can also test the fuse the other way around by putting the black probe of the multimeter on the battery negative terminal or body frame and the red probe on the fuse terminals one by one. Check the multimeter reading, if the voltage is full supply-voltage in both terminals of the fuse this indicates a good fuse.
If the multimeter reads the full supply voltage in one terminal and does not read the full supply voltage in the second terminal, it means the fuse has blown.