How to wire an accessory to the fuse box

Written by alexander eliot
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Wiring to your vehicle's fuse box is often the simplest way to connect and power aftermarket accessories, such as lighting kits or alarms. Stock vehicle wiring systems are often complex and difficult to work with. As such, wiring an accessory by splicing into a stock power wire can be intimidating. Wiring your accessories into the fuse box saves the trouble and complication of modifying your vehicle's stock wires. Note that accessories, which require a substantial power source, such as stereo amplifiers, should be directly connected to the vehicle battery, as wiring them into the fuse box is likely to blow the fuse and/or create other electrical malfunctions.

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Things you need

  • Fuse tap
  • Wire strippers
  • Electrical tape

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  1. 1

    Disconnect the vehicle battery before doing any electrical modifications to your vehicle to ensure user safety. Remove the plastic fuse box lid. Generally, the fuse box is located beside the vehicle battery in the engine compartment.

  2. 2

    Route your vehicle accessory's power wire to the fuse box location. Use the fuse layout diagram on the fuse box lid to choose a proper fuse to tap. For example, if you are wiring a lighting accessory, tap into the stock headlight fuse, as this will allow your accessory to be turned on and off with the vehicle headlight switch. If you are wiring an accessory that requires a constant power source, tap into one of the 12V power fuses.

  3. 3

    Replace the desired fuse with a fuse tap. Fuse taps plug in place of the stock fuse, and include a wiring connection splice. Plug your accessory's power wire into the fuse tap wire connection. Secure the connection tightly with electrical tape.

  4. 4

    Replace the fuse box lid. Tuck any excess accessory wiring aside, and secure with electrical tape if necessary. Start your vehicle and power on your accessory to ensure it has an adequate power connection.

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