CURT 7-Way Trailer Wiring Harness Extension 7 ft for Select Ford F-150/F-250/F-350 — Bed-Mounted RV Blade, Retains Rear Socket

CURT 57008 is a 7-foot plug-and-play 7-way RV blade wiring extension that routes a second trailer connector into your truck bed while retaining the original rear socket.

When towing fifth-wheel or gooseneck trailers from a pickup, you need a convenient, durable way to connect trailer lighting and auxiliary power inside the bed. The CURT 57008 extension plugs into your vehicle's existing OEM 7-way harness and delivers a factory-style connector inside the bed so you can hook up 5th wheel or gooseneck wiring without cutting, splicing, or sacrificing the bumper-mounted socket.

How does this harness keep both the bed and rear connectors usable?

The CURT 57008 is designed to maintain the original rear 7-way socket while adding a second one in the truck bed. It connects to the OE harness behind the bumper and runs through the body to a bed-mounted socket, giving you two accessible connection points without modifying factory wiring.

• 7-foot length positions the socket inside most truck beds.
• Plug-and-play connector attaches to the factory 7-way harness.
• Retains bumper-mounted 7-way for traditional trailer hookups.
• Factory-style 7-way RV blade socket for easy trailer connection.

Will this fit my Ford F-150, F-250 or F-350 Super Duty?

The extension was created for specific model years of Ford F-150, F-250 Super Duty and F-350 Super Duty trucks—confirm compatibility with your vehicle's year and factory wiring before purchase. Fitment depends on OEM harness location and bed construction; check the application guide or vehicle manual for exact match information.

• Designed to match OEM 7-way blade configurations used on select Ford trucks.
• Verify vehicle model year and OEM harness style for proper fit.
• Installation typically requires routing through an existing body opening.

How does it protect aluminum truck beds from galvanic corrosion?

Aluminum beds can react when steel fasteners and wiring contacts touch untreated surfaces. CURT includes isolators and plastic well nuts to separate hardware from the aluminum, preventing finish damage and reducing corrosion risk when mounting the bed socket and fasteners.

• Includes four plastic well nuts to isolate fasteners from aluminum surfaces.
• Four mounting bolts supplied for secure attachment without direct metal contact.
• Isolators keep electrical connections from contacting the bed metal.

What functions does the 7-way connection provide for trailers?

The 7-way RV blade carries standard trailer lighting circuits plus brake and auxiliary power, so your fifth-wheel or gooseneck trailer will receive the necessary signals for safe, compliant towing. It’s the common industry connector for larger trailers that need electric brakes and 12V power.

• Tail, brake, turn signal, and reverse light circuits carried on standard pins.
• Dedicated circuit for trailer electric brakes where equipped.
• Auxiliary 12V power pin for trailer accessories or battery charging.

Who is this for? The CURT 57008 extension is aimed at pickup owners who tow fifth-wheel or gooseneck trailers and want a neat, factory-like bed connection without cutting into factory wiring. It's also a good choice for owners of aluminum-bed trucks who need hardware isolation to avoid galvanic corrosion. If you need a reliable 7-way bed-mounted socket that preserves the rear connection and simplifies hookup, this harness provides a durable, vehicle-specific solution.