How to Add Wires to an Automotive Fuse Box | It Still Works Find the fuse box in your car. You may already know where it is; but if you don't, the best way to Open your car's fuse box and look for an "open" fuse slot. This is a fuse slot that is powered, but is Examine your fuse tap for the type of wire connector it accommodates. The fuse tap, as the name Strip 1/2 inch of insulation from the wire you'll be connecting to the fuse tap with a pair of wire See all full list on itstillworks 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.