Vehicle-specific plug-and-play harness that connects to your GMC Terrain's factory taillight wiring, providing a standard 4-way flat trailer connection with no cutting or splicing required.
If your GMC Terrain isn't already equipped with wiring for towing a trailer, the Curt 56566 is the ideal solution. This plug-and-play electrical device connects into your vehicle's existing wiring using OEM-compatible connectors at the taillight assembly, eliminating the need for cutting, splicing, or soldering.
Built specifically for select years of the GMC Terrain, this 4-way trailer wiring harness is constructed with surface mount technology (SMT) circuitry, which generates less heat, delivers optimal light intensity, and offers more durable performance than standard wiring. A rubber dust cover is included, promoting long-lasting use by protecting the connector against outdoor elements when not in use.
Standard connection for trailer lighting
Built for select Terrain model years
Plug-and-play connection to factory wiring
Less heat, optimal light intensity, durability
This harness is built for the redesigned, current-generation GMC Terrain (2024-2025). It is a different part from Curt's 56094 and 56429 harnesses, which cover the prior-generation Terrain shared with the Chevrolet Equinox (2018-2024) — a 5-way flat version (56594) is also available. The 2024-2025 year range is based on this part's placement in Curt's newer part-number series alongside the Terrain's model redesign; confirm your exact model year against Curt's official application guide or Vehicle Lookup tool at curtmfg.com before ordering.
Based on Curt's shared specifications across this harness family, expect a 2-wire system rated for approximately 6.0 amps on the tail light circuit and 3.0 amps on the stop/turn circuit. Part Number: 56566 | Related Parts: 56094, 56429 (Equinox/Terrain Combined), 56594 (5-Way Flat)
In The Package: • Vehicle-Specific 4-Way Flat Wiring Harness • Rubber Dust Cover