How to Wire a Car Fuse Box | DoItYourself wwwyourself››General Car Maintenance Safety Measures. First of all, take the proper safety measures prior to dealing with your car's The Fuse Box. The battery is the main source of power for the car but it needs electrical protection. The Wires. Wires provide the means between the system and the car fuse box. It is highly Start The Process. First clean the wires with the wire brush to keep everything clean. The car fuse See all full list on doityourself How to Wire Accessories to Car Fuse Panels | It Still Runs Slide the accessory's connector pin into the car fuse box. If there is no connector pin, unscrew the fuse box connector screw with a screwdriver. Strip 1/2 inch of sheathing from the wire with a wire crimper tool. Slide the bare wire under the connector and tighten the screw.