How do you check the integrity of a fuse?

To check the integrity of a fuse effectively, removing the fuse and testing for continuity through it is the most reliable method. This approach allows for a direct assessment of whether the fuse is functioning properly. When the fuse is out of the circuit, you can use a multimeter to check for continuity. A good fuse will have continuity, indicating that it can still conduct electricity without any breaks in the wire inside. If there is no continuity, the fuse is blown and needs to be replaced.

This method eliminates any potential interference from the circuit itself, which might affect measurements if the fuse were left in place. Other methods can lead to inconclusive results depending on the state of the circuit or voltage present. Visual inspection and other testing methods might not detect hidden faults within the fuse, such as internal breaks that aren't visible from the outside. Therefore, checking continuity with the fuse removed is the most definitive way to confirm its integrity.