7-Foot Custom Wiring Extension Harnesses (20-26 Sierra 3500 HD)Find parts that fit my vehicle

Custom Wiring Solution. The 7-foot Custom Wiring Extension Harness provides an easy way to add both 4-way flat and 7-way RV blade connectors inside your truck bed while preserving use of the existing factory rear socket. It simplifies connecting your 5th wheel or gooseneck trailer wiring, ensuring proper electrical communication for lighting and braking functions essential for safe towing.

Durable Construction And Appearance. The harness features a factory-grade black finish and includes protective slit loom housing that keeps wires neat and shielded. Connectors come with spring-loaded dust covers to prevent contaminants and corrosion, extending the harness's durability and maintaining clean connection points when not in use.

Installation. Installation is straightforward with a plug-and-play design that requires no cutting or splicing. A factory cutout in the truck bed is necessary to mount the additional socket. The right-angle plug and 7-foot length make routing and connecting the harness simple and convenient.

Warranty. Comes with a one-year limited warranty for peace of mind.

Application. Specifically designed to fit 2020-2026 GMC Sierra 3500 HD models for optimal compatibility.

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