Description
CURT 56566 is a custom 4-way flat trailer wiring harness for 2025-2027 GMC Terrain vehicles. It connects to the matching taillight wiring with plug-in T-connectors, while a powered converter handles the trailer lighting circuits without cutting or splicing the original wires.
Vehicle fitment
2025, 2026 and 2027 GMC Terrain, as listed in the manufacturer application table.
Electrical features
- Vehicle-side 4-way flat outlet operates trailer running, brake and turn lights.
- Battery power connection is required; the harness includes battery wiring and a fuse holder.
- SMT converter circuitry and a rubber connector dust cover are included.
- CURT states 6.0 amps for taillight circuits and 3.0 amps for turn and brake circuits. Do not exceed the lower vehicle or product rating.
Manufacturer part number: CURT 56566. Confirm the vehicle taillamp wiring configuration during installation.
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