How to Add Wires to an Automotive Fuse Boxby Nichole Liandi
If you're adding electrical or electronic components to your car, you'll need a source of 12-volt DC power. One of the best ways to tap into your car's electrical system is to take advantage of empty slots in the car's fuse box. It's a simple matter to add a power wire for your new gear by tapping into this resource.
Find the fuse box in your car. You may already know where it is; but if you don't, the best way to find it is to look in your car's owner's manual.
Open your car's fuse box and look for an "open" fuse slot. This is a fuse slot that is powered, but is not connected to any of the car's electronic or electrical components. If you're not sure which slots are available, consult the owner's manual--it will list each of the fuse locations and their functions.
Examine your fuse tap for the type of wire connector it accommodates. The fuse tap, as the name suggests, taps into the car's electrical system by taking the place of a fuse in the fuse box. You'll connect the power wire of any electronic or electrical device you're connecting to the fuse tap's connector. In most cases, the fuse tap employs a simple slide connector, but check the tap and its documentation to be sure.
Strip 1/2 inch of insulation from the wire you'll be connecting to the fuse tap with a pair of wire strippers and slide the appropriate wire connector onto the wire. Crimp the connector in place with a crimp tool.
Insert the fuse tap, with the wire connected, into the fuse slot of the fuse box, metal-bladed side first.