DICMIC 7‑Pin Trailer Wiring Harness Extension 83-inch Truck-Bed Mount — Weather‑Resistant, Copper Conductors

DICMIC 7-pin trailer wiring harness extension installs in your truck bed to add a second 7-way RV blade socket for towing 5th wheel or gooseneck trailers.

This heavy‑duty 83‑inch (210 cm) wiring extender creates a convenient connection point inside the truck bed so you can hook up a 5th wheel or gooseneck trailer without leaning over the bumper. Built with copper conductors and a rigid, weather‑resistant plastic housing, the assembly keeps all seven circuits—tail, brake, reverse, turn signals, electric brake, and auxiliary power—fully functional while protecting contacts with a snap‑button dust cover.

How does this extension make hooking up a 5th wheel or gooseneck easier?

The DICMIC harness relocates the standard rear 7‑way socket to a more accessible truck‑bed position so you can reach the connector from the trailer kingpin area. This reduces crawling under or stretching around the bumper, speeding up hookup and lowering the risk of bent pins or damaged wires.

• Adds a second 7‑way female socket inside the bed for direct trailer connection.
• 210 cm (83 in) length reaches from factory socket to bed‑side mounting points.
• Snap‑button dust cover keeps contacts clean between uses.

Will this fit my truck model and where should it be mounted?

The extension is compatible with popular full‑size pickups and works with the vehicle factory 7‑way wiring. Common fitments include Dodge RAM, Ford F‑Series, Chevy Silverado, GMC Sierra, Nissan Titan and Toyota Tundra. Typical mounting locations are the truck‑bed sidewall, tailgate post, or wheel well where a 2‑1/8" drilling hole can be made.

• Designed for Dodge RAM 1500/2500/3500, Ford F‑150 to F‑550, Chevy/GMC 1500–3500, Nissan Titan, Toyota Tundra.
• Mount in truck‑bed sidewall, tailgate post, or wheel well for easy reach.
• Requires a 2‑1/8" hole for secure installation.

How durable and weatherproof is the connector?

DICMIC uses pure copper conductors for reliable electrical flow and copper‑plated terminal pins for long‑term contact stability. The connector housing is molded from a solid plastic that balances stiffness and flex, and all wires and connectors are fully sealed to resist moisture and road grime.

• Pure copper wiring for improved conductivity and corrosion resistance.
• Sealed connectors with dust cover to prevent moisture intrusion.
• Rigid yet bendable housing holds up under repeated use and vibration.

What does the harness support electrically and during towing?

This 7‑pin extension carries the full set of trailer lighting and control circuits: running lights, brake lights, reverse lights, left/right turn signals, electric brakes, and an auxiliary power feed. It preserves the truck’s original 7‑way RV blade socket while providing an additional, convenient bed‑side socket for trailers that mate inside the bed.

• Transmits all seven trailer circuits, including electric brake control and auxiliary power.
• Retains factory rear socket while adding dedicated bed‑side access.
• Ideal for frequent gooseneck or 5th wheel hookups where quick access matters.

Who is this for? If you regularly tow 5th wheel or gooseneck trailers and need a safer, faster, and weather‑sealed way to connect inside the truck bed, this DICMIC extension is built for you. It’s aimed at pickup owners who want reliable electrical performance, corrosion‑resistant contacts, and a permanently mounted bed socket that saves time and reduces wear on factory connectors. Professional installers and DIY truck owners looking for straightforward fitment on common full‑size pickups will find this harness especially useful.