How to Use a Blade Terminal Splice for an Automotive Fuse Panel

Written by cassandra tribe
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How to Use a Blade Terminal Splice for an Automotive Fuse Panel
Always verify that a fuse can provide the correct amperage for the particular accessory. (Jupiterimages/liquidlibrary/Getty Images)

Automotive fuse panels are covered fuse boxes that have a separate ground wire running from the panel, instead of relying on the connection to the vehicle's battery to provide the ground point. Like automotive fuse boxes, the panels have blade terminal connectors protruding from each fuse slot for accessory power wire connections. When adding accessories to the vehicle, it may be necessary to use a blade terminal splice to connect two accessories to a single fuse. The common and non-technical name for these splice terminals is a piggyback blade terminal.

Skill level:

Things you need

  • Fuse panel diagram
  • Vehicle owner's manual (if needed)
  • Single female to double male splitter piggyback blade terminal
  • Electrician's pliers
  • 2 single female spade terminals
  • Dielectric grease

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  1. 1

    Locate the correct fuse for the accessory to be connected to on the fuse panel diagram. The fuse panel diagram is typically found mounted next to or on the fuse panel cover. There is also a copy of the diagram in the vehicle owner's manual. The correct fuse size for the accessory is listed with the accessory specifications.

  2. 2

    Push the female end of the piggyback blade terminal splice onto the blade connector for the fuse to be used that is protruding from the fuse panel. Make sure that the double male end of the terminal splice has one of the male ends pointing up or out from the panel -- not into the body of the vehicle -- so the blades of the terminal splice can be reached easily.

  3. 3

    Use electrician's pliers to strip 1/4 inch of insulation from the end of both accessory wires that will connect to the blade terminal splice.

  4. 4

    Crimp a female spade connector onto the end of each accessory wire using electrician's pliers.

  5. 5

    Push the female connector of each wire onto one of the male blades of the blade terminal splice on the automotive fuse panel.

Tips and warnings

  • Place a small amount of dielectric grease on the male ends of the piggyback terminal to protect the connection from moisture, corrosion and debris.
  • Make sure the fuse in the panel to which you're connecting the accessory has enough amps to power it or the fuse will blow.

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