Chevrolet Silverado 2007-Present: How to Install Trailer Wiring Harness

This article applies to the Chevrolet Silverado 1500 (2007-present).

Part of the reason you probably bought a truck in the first place is because you intended to use its ability to tow formidable loads with ease. Whether you are towing a boat, a classic car, or just a trailer full of junk, you must first install a trailer wiring harness to make sure the brake lights on your trailer work. Without a proper connection, you run the risk of a ticket or even an accident. Thankfully, installing a harness is an easy and relatively quick job that anyone can complete.

Step 1 – Back the truck up to the trailer tongue

Making sure you are on level ground and back up the truck as close as possible to the trailer tongue. Put the truck in park and set the emergency brake.

Step 2 – Locate the wiring harness

The truck's wiring harness is typically located either attached underneath the rear bumper, or on the driver's side between the back tire and the back of the bed. Open the door of the harness, or squeeze the center clasp and separate the two parts of the harness, depending on which type of harness you have.

Step 3 – Connect the harness

With most newer harnesses, you simply plug the trailer's connector into the harness. In some instances, you will need a T-connector, especially if you have an older harness that is located underneath the bed of the truck. Secure any excess wiring with zip ties.

Step 4 – Test the lights

Have a buddy stand behind the trailer while you press the brakes, flip on the turn signals, and turn on the headlights to ensure everything is working before heading out on the road.

Related Sites

• Trailer Wiring Harness Diagram - eTrailer.com
• How to Install a Wiring Harness - Car-Maintenance.com