How to hardwire in a vehicle fuse box

Written by alexander eliot
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Hardwiring into the fuse box is often the easiest way to connect electronic accessories to your vehicle. Aftermarket modifications such as headlights or underglow kits require a stock power source. However, splicing into the stock wiring system can be difficult and intimidating. Using a fuse tap to wire your accessories to the stock fuse panel allows you to safely power your aftermarket accessories, while saving you the trouble of having to cut and splice any stock wires.

Skill level:

Things you need

  • Fuse tap
  • Electrical tape
  • Wire cutters
  • Fuse puller

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  1. 1

    Turn off the engine. Disconnect the battery prior to working with the fuse box or any other vehicle electronics. Open the bonnet and loosen the clamp holding the negative cable to the battery, then lift off the clamp.

  2. 2

    Locate the fuse box you wish to wire into. For exterior accessories, use the fuse box located in the engine bay, generally beside the vehicle battery. For in-car accessories, use the interior fuse box, generally located in the driver's side footwell.

  3. 3

    Remove the plastic fuse box cover. On top of the cover, you will see a fuse layout diagram. Use this diagram to locate the fuse you wish to wire into. For example, if you are wiring an aftermarket lighting accessory, use the stock headlight fuse, as this will let you turn your lighting accessory on and off with the stock headlight switch.

  4. 4

    Use a fuse puller to remove the desired fuse. Fuse pullers are pliers specially made for fuse removal. Carefully grip the sides of the fuse body with the fuse pullers, then remove the fuse by pulling it upward. Replace the fuse with a fuse tap by plugging the tap into the original fuse slot.

  5. 5

    Use wire cutters to strip approximately 15mm of insulation from the end of your electronic accessory's power wire. Firmly insert the exposed end of the power wire into the fuse tap connection. Secure the connection with electrical tape. Replace the fuse box cover. Tuck all excess wiring aside, and secure with electrical tape. Reconnect the vehicle battery. Turn on your electronic accessory to ensure a proper power connection.

Tips and warnings

  • If that fuse box diagram is missing, consult your vehicle's owner's or service manual to find the chart.

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