To test a car fuse, you can use either a multimeter or a test light, or simply perform a visual inspection after removing it from its housing. A multimeter can be set to continuity mode to check for a continuous electrical connection within the fuse; a beep or very low resistance indicates a good fuse, while no sound or a high reading signals a blown fuse. A test light can be connected to a ground, and if the light illuminates on both sides of the fuse's terminals, it's good. If the fuse's inter