How to Splice Wires in a Car or Truck

how to splice wires in a car or truck

If you’re wiring parts like lights or tow mirrors, extending the wire or splicing the wire to the wiring harnesses can be a useful method to complete the install and can sometimes reduce the amount of wiring. These steps explain how to splice wires in a car the next time you need to extend a wire or splice one in two directions.

How to Splice and Extend an Automotive Wiring Harness or Electrical Wire

How to Splice Wires in a Car in 5 Steps

Tools Required

  1. Wire Cutters
  2. Razor
  3. Wire Strippers
  4. Butt Connectors
  5. Electrical Tape

How to Splice or Extend an Automotive Electrical Wire

  1. Pick a Spot on the Electrical Wire

    Pick a spot on the electrical wire near the connector. The spot does not need to be close to the connector.

  2. Cut the Wire

    Cut the wire with wire cutters

  3. Slice the Outer Sheath

    Cut the outer sheath with a razor blade

  4. Strip the Insulation

    Strip the insulation from the ends of the wires an inch or two with a wire stripper

  5. Twist the Copper Core

    Twist the copper wire core ends

  6. Repeat These Steps for Additional Wiring Harnesses or Wire Extensions

    Repeat the steps above for any wire extensions

  7. Twist Any Additional Wiring Harnesses or Wire Extensions Together

    If you’re splicing or branching a wire in two different directions, twist any corresponding wires on the branched wires together. For example, if you’re splicing a wire to two wiring harnesses, twist the copper cores of each matching wire on the wiring harnesses together. In the picture below, we twist the copper cores of the red wires together and the copper cores of the black wires together.

  8. Connect a Butt Connector to Each Branching Wire

    Connect the double wire side of a butt connector if two wires are connected, like in this case. Twist a butt connector on as tight as possible to each wire that will branch off.

  9. Crimp the Butt Connector to Each Branching Wire

    Crimp the butt connector to the now-branched wire. Tug on the butt connector to confirm it’s connected tightly

  10. Connect the Wire Extension

    Connect the wire extension to the butt connector and twist it in as far as possible

  11. Crimp the Butt Connector to the Wire

    Crimp the butt connector to the wire extension

  12. Apply Electrical Tape to the Extended Wire

    Seal electrical tape to the extended wire to keep the wires connected and to protect the wires from outside elements

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Related Content

Summary
How to Extend an Electrical Wire in Your Car, Truck, or SUV
Article Name
How to Extend an Electrical Wire in Your Car, Truck, or SUV
Description
Learn how lengthen or splice wires in your car or truck with these steps explaining how to extend an electrical wire yourself. This information is useful for installing accessories and other parts that require wiring, like tow mirrors
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Publisher Name
1A Auto
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