How to Test a Fuse With a Test Light: A Simple Technique

How To Test A Fuse With A Test Light

A car fuse is an electrical component that is used to protect the wiring in a vehicle from overheating. The fuse is made of a metal strip that melts when the current flowing through it becomes too high. This interrupts the flow of electricity and prevents the wires from overheating.

If your car’s electrical system isn’t working, one possible culprit is a blown fuse. You can check this yourself with a test light. Keep reading to learn how to do this simple but important task.

How To Test A Fuse With A Test Light

Technician Checking Car Fuse by Lamp Tester
Technician Checking Car Fuse by Lamp Tester

Testing a car fuse with a test light is one of my favorite methods to find out a blown fuse because it is very easy. If you’re wondering how to test a car fuse with a test light the right way, you’ve come to the right place. In this method, we will use a test light to identify a good or bad fuse.

This method of testing involves flashing test lights in both terminals of the fuse.

This Is A Note
This procedure can only be performed on fuses present in the live circuit.

Step 1. Turn ON The Suspected Circuit

Switch ON the suspected fuse’s circuit.

Step 2. Connect The Test Light With Battery & Fuse

Testing The Car Fuse
Placing The Test Light On Fuse’s Terminals

Place the negative pole of the test light on the body frame or on the battery negative terminal
Place the second pole on small metal tabs on top of the fuse one by one (Terminals are exited from the upside of the blade fuse casing).

Step 3. Look At The Test Light Flashing

A Flashing Test-Lamp While Checking Car Fuse
A Flashing Test-Lamp While Checking Car Fuse

If the test light flashes in both terminals of the fuse, It indicates the fuse is good. If the test light flashes on One terminal of the fuse and does not flash on the other terminal, it means the fuse has blown.


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