EASY TO INSTALL - No cutting! No splicing! This trailer wiring harness kit plugs into existing factory wiring on your vehicle and equips it with a standard, rear 4-pin trailer wiring connector for plugging in and towing a trailer Connecting Components: 4-Pin Trailer wiring harness is a component for the electrical system connection between the vehicle and the trailer, and the electrical system of the tractor and the trailer is connected together through a 4-pin connector, so that the trailer's brake lights, turn signals and taillights can work normally Stable Operation: By providing a stable electrical connection, trailer tow hitch wiring connector relay harness kit ensures that the steering lights and signaling system of the trailer work properly, improving driving safety at night and in bad weather, which is especially important for long trips Relay Protection: 4-Way Trailer wiring harness connector kit can be used to protect the electrical system of vehicles and trailers from overload and short circuit, which can extend the service life of electrical components and avoid frequent maintenance troubles Connection: 4 Pin Flat,6 Pin Female Connector Power: 12V DC, 40A; Replace 56429 Custom fits for 2018-2024, for Terrain 2018-2024 Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Note:Due to different production batches, the color of wire harness is random, and the designation is not accepted. There are some differences between the object and the picture, which does not affect the normal use. Color:As Shown Material:plastic Package Contents: 1 * 4-Pin Trailer Wiring Harness Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.