How to Wire a Trailer Tail Light

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Trailer tail lights and side marker lamps are connected electrically to the automobile tail lamp system. These lights are used for providing illumination to the shell of an automotive trailer. Connecting tail lights to a trailer requires a connection to the brown or green wire on the trailer wiring harness.

Things You'll Need

  • Brown electrical wire
  • Electrical pliers
  • Splice terminal connectors
  • Trailer tail lamp or side marker lamp
  • Trailer-side connector harness
  • Cut a piece of electrical wire that will reach from the harness to the tail lamp or side marker lamp. Place the first splice connector over the trailer harness tail lamp wire; this wire is green if the trailer harness has seven wires, brown if the trailer harness has six or fewer wires.

  • Insert one end of the unconnected electrical wire into the splice connector and crimp the splice connector to connect the tail lamp wire to the electrical wire.

  • Place the second splice connector over the tail lamp or side marker lead wire. Insert the free end of the electrical wire into the splice connector. Crimp the splice connector to connect the lamp lead to the electrical wire.

  • Attach the side marker or tail lamp to a metal surface on the trailer.

References

  • Photo Credit Trailer on Grass image by Towards Ithaca from Fotolia.com
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