How to connect wires to automotive fuses

Written by francis walsh
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How to connect wires to automotive fuses
Fuses (Creatas/Creatas/Getty Images)

Ask anyone who has bolted on some extra horsepower and a way to gauge it, and he will tell you that to get it to work right he had to wire it correctly. You will need to know how to connect wires to automotive fuses if you plan to add a new gauge, light, computer controller or accessory that requires a source of power. All the wiring you need already exists within the vehicle's wiring harness; you just need to know how to connect new wires to the circuit and the best way is through the fuse box.

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Things you need

  • Vehicle
  • Adjustable wrench
  • Needle nose pliers
  • Wire strippers
  • Fuse box
  • Fuse tap
  • New wiring

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  1. 1

    Find the vehicle's fuse box located either in the passenger compartment of the vehicle or under the hood on many trucks. Open the lid of the fuse box using the fastening clamps located on one or all sides of the fuse box lid. Squeeze the clamps and pull the lid free.

  2. 2

    Disconnect the red positive battery cable from the vehicle's positive battery post. Keep the cable end away from the battery when you connect wires to automotive fuses to prevent shorting out the vehicle's wiring and computer system.

  3. 3

    Attach a fuse tap on the end of the new wires that will be connected to the fuses inside the fuse box. Cut and strip the end of each wire that will have a fuse tap attached with wire cutters approximately 6 mm (1/4 inch) in length. Expose enough wire so that the fuse tap can be slid over the end and tightly squeezed with pliers to fasten on the end of the wire. Repeat the process for all the wires that will connect to the automotive fuses when finished.

  4. 4

    Locate the correct fuse for the wire to be connected to. Remove the fuse from the fuse box and place the fuse tap at the end of the fuse and reinsert the fuse back into the fuse box. The fuse tap will be held in place by the pressure of the fuse against the fuse box terminal. Each wire can be supplied with power using this technique. Connect wires to automotive fuses using wire taps after checking with the installation manual and finding the appropriate fused connection to work with your new wiring.

  5. 5

    Cover the fuse assembly when finished wiring new equipment using fuse taps to power the parts. Test the new equipment by operating the vehicle. Automotive gauges can be quickly wired using fuse taps when the instructions detail the appropriate source of power that is fuse protected.

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