Electrical Instructions for Wiring a Chevy Trailer Hook


Chevrolet manufactures a number of vehicles that function well as towing platforms, and range from mid-size sport utility vehicles to heavy-duty pickup trucks. Most have a factory-fitted trailer hook on a dedicated bracket, together properly called a tow package, located at the center rear of the vehicle. To safely tow with the trailer hook, an electrical connection, called a hitch, must be made to the trailer to operate the legally mandated lights. For heavier trailers a trailer brake control unit also should be wired to the hitch. A lights-only hitch is typically a flat four-pin configuration, while the more complex hitch is typically a round seven-pin configuration.

Things You'll Need

  • Flat four-pin hitch
  • Round seven-pin hitch (optional)
  • Color-coded wires
  • Wire splicers
  • Plastic cable ties
  • Wire a flat four-pin hitch, usually sold with a harness attached, to the Chevy observing the following color codes: Splice the green wire into the right turn blinker circuit, the yellow wire into the left turn blinker circuit and the brown wire into the tail lights circuit. Connect the white wire to ground.

  • Wire a round seven-pin hitch, typically sold without a wiring harness, to the vehicle observing the following color codes: Run a white 10-gauge wire between ground and terminal one, run the blue 12-gauge wire between the electric brake controller and terminal two, the brown 14-gauge wire between the taillights and terminal three, the black 10-gauge wire between the permanently live 12-volt supply and terminal four, the yellow 14-gauge wire between the left turn/brake light and terminal five, the green 14-gauge wire between the right turn/brake light and terminal six and the purple 14-gauge wire between the backup light and terminal seven (in the center).

  • Use plastic cable ties along all runs of wire to secure them so they cannot come into contact with hot or moving parts or create a trip hazard.

Tips & Warnings

  • Many Chevy vehicles have a factory-installed under-dash port -- or a cluster of four wires -- into which an aftermarket brake controller can be plugged, usually taped near the steering column. Consult your owner's manual to learn if one is present in your vehicle; if so, wiring a round seven-pin hitch is made much easier.

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  • Photo Credit camping,trailer image by Greg Pickens from Fotolia.com
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