Oyviny 4‑Pin Trailer Wiring Harness for GMC/Cadillac/Chevy/Buick — 77in, 16 AWG plug‑and‑play 4‑flat connector

The Oyviny Custom 4‑Pin Trailer Wiring Harness provides a factory‑style 4‑flat connector to add trailer lighting and signaling to compatible GMC Acadia, Cadillac XT5/XT6, Chevy Blazer and Buick Envision models without splicing.

If you need a simple, reliable way to hook a small trailer, cargo carrier or light tow accessory to your SUV, this plug‑and‑play harness installs into the OEM tow outlet so you get a proper 4‑way connection for tail, brake and turn signals. Built with 16 AWG bonded copper conductors, a weather‑resistant connector and a generous wiring length, the harness is designed for straightforward installation and long‑term durability.

Which vehicles will this wiring harness fit?

This harness was tailored for select model years and slots into the factory tow harness on those vehicles. Confirming compatibility before purchase is recommended so the connector matches your vehicle's OEM trailer wiring port.

• GMC Acadia: compatible years 2017–2023
• Cadillac XT5: compatible years 2017–2025
• Cadillac XT6: compatible years 2020–2025
• Chevrolet Blazer: compatible years 2019–2025
• Buick Envision: compatible years 2021–2025

How easy is the installation for a non‑professional?

Installation is designed to be straightforward: the harness plugs into the OEM tow package connector with no need to cut, splice or modify factory wiring. Most users can complete the install with basic hand tools and a few minutes of time.

• Direct plug‑in to the OEM tow harness—no wiring splices required
• Includes 77 inches of cable for flexible routing options
• Typical install time: minutes to under an hour for most owners

What are the electrical and durability features?

The harness uses 16 AWG bonded pure copper conductors for efficient current flow and consistent lighting performance. The connector includes corrosion‑resistant contacts and a rubber dust cap to keep moisture and debris out when not in use.

• 16 AWG bonded copper wires for stable conductivity
• Tin‑plated terminals resist corrosion and improve contact life
• Rubber dust cover protects the 4‑flat socket from elements

What types of trailers and lights will this 4‑way connector support?

The standard 4‑flat connector carries tail, brake and left/right turn signals plus ground, covering most small trailers, bike racks and cargo carriers that rely on basic lighting circuits. It is not intended to carry auxiliary power or feed electric trailer brakes.

• Supports trailer tail lights, brake lights and turn indicators
• Compatible with most light‑duty trailers and hitch accessories
• Not intended as a charging or powered auxiliary connection

Who is this for: The Oyviny 4‑pin harness is aimed at owners of the listed GMC, Cadillac, Chevrolet and Buick SUVs who want a factory‑style 4‑way trailer connector without modifying vehicle wiring. It's ideal for drivers who tow small trailers, use hitch‑mounted cargo carriers, bike racks or occasional towing and prefer a durable, weather‑protected plug that integrates cleanly with their OEM tow package.