Often,the boxis half hidden under the dashboard or in the front knee-well. When an electrical component stops working the faultmay be in the component,in the electrical circuit or in the fusethat protects them. Because the fuseis a likelycause,and the easiest to check,lookat it first. Checking and replacing fuses | How a Car Works Was this helpful? How Do Fuses and Fuse Boxes Work? - thespruce The Fuse Box. A fuse box has a series of threaded sockets into which the fuses are screwed in like light bulbs. Each circuit in the home is protected by a fuse, and each fuse must be the correct type and appropriately rated for its circuit. Using the wrong type of fuse for Author: Bob Formisano How to Check a Fuse at the Home Fuse Box | Home Guides Dec 19, 2018How to Check a Fuse at the Home Fuse Box. Replace the blown fuse with a new fuse having the same amperage rating as the blown fuse. Screw the new fuse into the threaded socket that held the old fuse. Turn on house power. The circuit should return to life. Close the fuse box door. Pick up the mat and store it away.