Gledewen 7-Pin Trailer Wiring Harness, 7ft Bed Extension — 7-Way RV Socket, No-Splice Install (1997–2021 Trucks)

The Gledewen 7-pin trailer wiring harness kit is a 7-foot extension that adds a second 7-way RV socket in your truck bed so you can tow fifth-wheel and gooseneck trailers without cutting or splicing factory wires.

If you tow trailers with a pickup, simple access to a 7-way connector in the bed makes hooking up easier and safer. This kit is engineered to plug into your truck’s existing factory trailer connector, extending the OEM socket to the truck bed while preserving the original rear harness. It’s compatible with many full-size trucks from 1997–2021, including Ford F-Series, GM Sierras and Chevys, Ram, Nissan Titan and Toyota Tundra models listed below.

Will this harness fit my truck model and years?

The extension is designed to match the factory tow wiring on many common pickups; compatibility is provided by model and year ranges and exact part numbers (56070, 55415). Before buying, confirm compatibility by matching your vehicle year, make, model and engine size, or send your vehicle photo to the seller for verification.

• Fits many Ford F-150/F-250/F-350/F-450/F-550 model years listed (1997–2021 ranges).
• Compatible with GMC Sierra and Chevrolet Silverado full-size trucks across 1999–2021 ranges.
• Also fits Ram (2009–2021 ranges), Nissan Titan (2004–2021 ranges), and Toyota Tundra (2010–2021).
• Check precise fit part numbers 56070 and 55415 to confirm vehicle match.

How do I install the 7-foot extension harness?

Installation is straightforward if you have basic hand tools and a 2-1/8-inch hole saw. The harness plugs into the factory connector—no splicing—then you secure the new 7-way socket in the truck bed with the supplied mounting holes and organize the cable with straps.

• Drill a 2-1/8" hole at the chosen truck-bed mounting location.
• Lay out the harness, connect to factory parking/turn signal connector.
• Drill and use four 7/64" screws to secure the 7-way connector flange.
• Tidy wiring with grab straps and finalize routing for protection.

What signals and trailer functions does the extension support?

This 7-pin extension preserves all common RV and trailer circuits so you can power taillights, turn signals, trailer brakes and auxiliary 12V power from the bed-mounted socket. The design minimizes electrical resistance to reduce voltage drop and protect components over time.

• Supports brake lights, turn signals and reverse lights.
• Provides electric trailer brake control circuit and auxiliary power.
• High-quality conductors reduce heat and voltage loss during towing.
• Durable outer wrap offers corrosion, water and abrasion resistance.

What quality and warranty protections come with this harness?

Gledewen builds the extension from robust materials with heat- and chemical-resistant jacketing to withstand under-bed conditions. The kit is made by an ISO-certified manufacturer and includes a 24-month warranty against defects, so you can replace or repair within that period if problems arise.

• ISO-certified manufacturing and factory-matched connectors for plug-and-play use.
• Wrapped plastic sheathing resists heat, chemicals, corrosion and wear.
• 7-foot length gives flexible mounting options inside the bed.
• 24-month warranty and direct seller support for issues or installation questions.

Who is this for: The Gledewen 7-pin trailer wiring harness extension is for pickup owners who tow fifth-wheel or gooseneck trailers and want a convenient, factory-compatible 7-way socket in the truck bed. It suits DIY installers with basic tools, fleet vehicles that need a durable bed-mounted connector, and anyone who wants to avoid cutting or splicing factory wiring while retaining full trailer function support. If you’re unsure about fit, provide your vehicle YEAR, MAKE, MODEL and ENGINE SIZE or send a photo to confirm compatibility before purchase.