CURT 56070 7-Foot Truck Bed 7-Pin Wiring Harness Extension

In this review of the CURT 56070 wiring harness extension, the bottom line is simple: this is a practical add-on for truck owners who tow fifth wheel or gooseneck trailers and want a convenient, bed-mounted 7-way socket. Installation is straightforward because it plugs into the truck's existing OEM rear connector with no cutting or splicing, and the 7 ft length gives flexible placement in the bed. The harness keeps the factory rear 7-way socket functional while adding a protected, bed-mounted socket for easier hitch hookup.

Key Features

• Truck bed extension: Provides a dedicated 7-way socket in the truck bed so trailer electrical connections are within easy reach when hitching a fifth wheel or gooseneck.
• Easy to install: Plugs into existing factory wiring with no cutting or splicing required, reducing install time and the chance of wiring mistakes.
• 7 ft harness length: Offers enough cable to position the socket where needed in most truck beds without straining the factory connector.
• Heavy-duty connector: Supports taillights, brake lights, reverse lights, turn signals, electric brakes and auxiliary power for complete trailer functionality.
• Durable construction: Molded black plastic housing with a spring-loaded dust cover protects the pins from dirt and moisture for long-term reliability.
• Vehicle-specific fit: Designed for select Chevrolet, Dodge, Ford, GMC, Nissan, Ram and Toyota models to simplify installation and fitment.

Who It's For

This harness is aimed at pickup owners who regularly tow heavier trailers like fifth wheels or goosenecks and prefer hooking into a bed-mounted socket for convenience. It is especially useful when the tow setup requires frequent connect and disconnect at the hitch and when retaining the rear bumper 7-way socket is important.

It is less suitable for drivers who do not tow or who need a custom-length harness beyond the supplied 7 ft. Buyers who want an all-weather sealed, hardwired installation may prefer a dedicated hardwired kit rather than a plug-in extension.

Pros & Cons

Pros

• Plug-and-play installation avoids wire cutting and splicing for quick fitment.
• Maintains use of the rear 7-way socket while adding a convenient bed-mounted connector.
• Sturdy housing and spring-loaded dust cover protect the connection when not in use.
• Fits select truck makes and models for an easier, vehicle-specific install.

Cons

• Limited to the included 7 ft cable length, which may not suit every bed layout.
• Requires a 2-1/8 in hole saw for mounting, adding a small drilling step to installation.

Specifications

Product type	Truck bed 7-pin trailer wiring extension
Connector	7-way RV blade socket
Harness length	7 ft
Housing	Molded black plastic with dust cover
Installation	Plugs into factory wiring, no cutting or splicing
Vehicle fit	Select Chevrolet, Dodge, Ford, GMC, Nissan, Ram, Toyota
Mounting hole	Requires 2-1/8 in hole saw

Our Verdict

The CURT 56070 is a sensible, value-minded solution for truck owners who need a bed-mounted 7-way socket for fifth wheel or gooseneck towing. It preserves the factory rear connector, installs without cutting or splicing, and uses durable materials to protect the connection. For those who tow regularly and want the convenience of a bed-mounted plug without complex wiring, this extension is a practical buy.

Frequently Asked Questions

Will this harness keep my rear bumper 7-way socket working?
Yes. The harness is designed to retain use of the factory rear 7-way RV blade socket while adding a bed-mounted socket.

Do I need to splice or cut any wires to install it?
No. Installation is plug-in to the existing factory wiring with no cutting or splicing required.

What size hole is required for mounting?
The mounting requires a 2-1/8 in hole saw to fit the bed-mounted socket.