How to Wire a Trailer Connection to a Car

Written by desdemona delacroix
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How to Wire a Trailer Connection to a Car
Make sure your trailer lights are working correctly after you hook them up to your car. (camping,trailer image by Greg Pickens from

Getting a trailer hooked up to your car isn't as difficult as it may seem. All you need is to make sure the car can lift the weight of the trailer and your trailer lights are all working properly. If your car isn't equipped with a tow hitch, get one professionally installed and have them pre-wire the trailer connections with it. Otherwise, just make sure the existing tow hitch will support your trailer, and find the hookup for the lights.

Skill level:

Things you need

  • Wire cutters
  • Wire crimpers
  • Wire connectors

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  1. 1

    Look at the plug on the trailer lights. Your car may have a pre-existing plug that matches the trailer already, so check out the back of your car around the tow hitch and behind the bumper to see if you can just plug the trailer right in. If there is a pre-existing plug that doesn't match exactly, you can buy an adaptor to fit them together.

  2. 2

    Find the wires that lead to your existing lights if there is no pre-existing plug. These will likely be running underneath the vehicle or behind the panelling inside the back of the car. You will need to find a minimum of four wires: a white one for the ground, a brown one for running lights, a green one for the right turn signal and a yellow one for the left turn signal.

  3. 3

    Check out the plug on the end of the trailer connector. If it is a four-way plug, simply match up the wires and connect them. You may need to buy an adaptor if the number of wires doesn't match the plug. Alternatively, if you own the trailer and can do so, simply chop the trailer plug off and splice the wires together by cutting the wires (leaving about a half inch of copper exposed), sticking them in a connector, and crimping the connector closed.

Tips and warnings

  • Always check that your trailer lights are working properly before driving off.

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