Curt 56080 Fifth Wheel and Gooseneck Wiring Extension Harness - 7-Way to 5-Way Adapter

Stop Fighting Short Harnesses on Long-Bed and Short-Bed Truck Setups

One of the most common frustrations when setting up a fifth wheel or gooseneck tow rig is discovering that the factory or aftermarket trailer connector simply does not reach the trailer's plug socket once the hitch is installed in the bed. Cab-to-bed routing adds length, over-rail or under-rail slider hitches push the connection point further back, and suddenly you have a harness that is 12 to 18 inches too short.

The CURT 56080 solves that problem directly. It extends the wiring run so your existing 7-way RV blade connector reaches the trailer socket cleanly, without loops of slack hanging near moving parts or zip-ties pulling a connector at an angle. It is engineered to carry all standard trailer circuits -- running lights, brake lights, turn signals, electric brake output, reverse lights, battery charge, and auxiliary power -- without voltage drop or signal degradation across the added length.

Who Needs This Extension?

This extension is the right solution in several common scenarios:

• Short-bed trucks (5.5 ft or 6 ft beds) with a slider or short-bed fifth wheel hitch -- the hitch slides rearward for turns but the factory plug does not follow
• Long-bed trucks where the factory 7-way plug is mounted at the tailgate and the in-bed connector position is still too far from the trailer's socket
• Gooseneck trailers with a 7-way socket mounted at the neck, positioned further forward than a standard bumper-pull socket
• Custom bed installs or flatbeds where the factory plug was relocated or is missing entirely and a bed-mounted drop needs to be extended
• Any rig where the existing connector has to be bent, looped, or forced into position -- stressing the wiring and risking intermittent connections

Compatibility with CURT Hitches and Other Brands

The 56080 uses the industry-standard 7-way RV blade connector format (SAE J560 standard) on both ends, which means it is compatible with virtually every fifth wheel hitch and gooseneck ball-equipped truck on the road, regardless of whether the hitch itself is a CURT product. It will work with:

• CURT fifth wheel hitches (Q-series, A-series, and standard series)
• B&W Turnoverball and Companion fifth wheel hitches
• Reese, Husky, and Drawtite fifth wheel and gooseneck hitch systems
• Any trailer (fifth wheel or gooseneck) with a standard 7-way RV blade socket
• Truck-side 7-way factory connectors from Ford, GM/Chevrolet, Ram, Toyota Tundra, and Nissan Titan

Installation Overview

Installation is straightforward and does not require any wiring knowledge for most applications:

• Locate your existing 7-way plug on the tow vehicle (typically mounted at the tailgate area or on a bracket near the hitch receiver)
• Plug the female end of the 56080 into your existing vehicle connector
• Route the extension cable through the bed to your desired drop point above or near the hitch
• Secure the cable with appropriate loom clips or cable ties, keeping it away from hitch moving parts
• The male end of the extension becomes your new connection point for the trailer's 7-way socket

Product Specifications

Connector Specifications

Compatibility Reference

Circuit Compatibility

In the Box