Oyviny 4-Way Trailer Wiring Harness 55540 for Chevy Express/GMC Savana (2003–2023) — Plug-in Weatherproof

Oyviny's 4-way trailer wiring harness 55540 installs a weatherproof, plug-and-play 4-flat connector on compatible 2003–2023 Chevy Express and GMC Savana trucks for reliable trailer lighting and turn/brake signal operation.

Whether you're towing a utility trailer, boat, or camper, the right wiring harness makes the difference between safe, legal towing and flaky lights or time-consuming repairs. This custom-fit harness is designed to match factory plugs on many Chevrolet Express and GMC Savana models, giving you a neat, durable connection without cutting or splicing factory wiring.

How does this harness attach to my Chevy Express or GMC Savana?

The Oyviny 55540 is a direct-fit harness that plugs into the vehicle's existing trailer wiring connector locations. No modifications to factory wiring are required, so installation is faster and keeps OEM electrical integrity intact.

• Direct plug-in design that matches factory sockets on compatible model years
• No cutting, crimping, or splicing—reduces installation time
• Approximately 80 inches of lead length for routing flexibility

What lighting functions does the 4-way connector support?

This 4-flat connector carries the essential trailer lighting circuits used by most small trailers: tail/running lights, left and right turn signals, and brake lights. It’s the industry standard for many utility and boat trailers.

• Tail/running light circuit compatible with most trailers
• Left and right turn signals and brake light circuits included
• Works with trailers that expect a standard 4-flat interface

Is the harness durable enough for road and weather exposure?

Oyviny designed this harness for longevity in real-world towing conditions. It uses corrosion-resistant components and protective sleeving to resist abrasion and moisture, and comes with a rubber dust cover for the connector when not in use.

• Corrosion-resistant 4-pin flat connector with rubber dust cap
• Pure copper conductors for solid electrical conductivity
• Black nylon net tube sleeving protects wires from wear and weather

Which vehicle models and years are compatible with this kit?

The kit covers a broad range of Chevy Express and GMC Savana vans and trucks. Confirm compatibility with your vehicle model and year before purchase to ensure a perfect plug-in fit.

• Chevrolet Express 1500: 2003–2014
• Chevrolet Express 2500 & 3500: 2003–2023
• GMC Savana 1500: 2003–2014; Savana 2500 & 3500: 2003–2023

Who is this for? The Oyviny 55540 4-way trailer wiring harness is ideal for DIY vehicle owners, fleet managers, and tradespeople who need a reliable, OEM-friendly trailer connector for their Chevy Express or GMC Savana. If you want a simple, durable solution without altering factory wiring—and flexible routing thanks to the long lead length—this harness provides a straightforward installation and dependable trailer lighting performance.