Nilight 4-Pin Trailer Wiring Harness for 2016–2023 Toyota Tacoma — 4-Flat OEM Fit, Dust Cover & 10A Fuse

If you tow occasionally or regularly with a Toyota Tacoma, this Nilight wiring harness adds a standardized 4-way flat trailer connector without cutting factory wiring. Designed to mate with the Tacoma's taillight harnesses, the kit installs quickly and stows neatly beneath the hitch. Included hardware and a dust cover help protect the connection from road grime and moisture so your trailer wiring remains reliable over time.

How does this harness connect to a 2016–2023 Toyota Tacoma?

The harness uses vehicle-specific, OEM-compatible plugs that attach directly to the factory wiring behind the driver and passenger taillight housings. No splicing or permanent modifications are needed, keeping factory wiring intact and simplifying installation or removal.

• Direct-fit connectors for factory tail lamp harnesses
• Plugs into locations behind both taillight housings
• No cutting, soldering, or permanent wire changes
• Includes mounting screw and multiple zip ties for tidy routing

What lighting functions and trailer types does the 4-pin connector support?

The standard 4-flat connector transmits running lights, brake lights and turn signals. It’s ideal for light-duty trailers, cargo trailers, small utility trailers, and boat trailers that use combined signal circuits rather than separate brakes or auxiliary functions.

• Feeds tail/running lights, left/right turn signals, and brake lights
• Compatible with most trailers using a 4-way flat plug
• Not wired for trailer brakes or 12V auxiliary power feeds
• Connector stows beneath the hitch when not in use for convenience

Is the Kit durable and weatherproof for outdoor use?

Nilight includes a tight-fitting rubber dust cover and a rugged 4-pole connector to protect the contact points from dirt and water. Durable wiring and a 10A fuse provide basic circuit protection while the supplied routing hardware reduces stress and chafing during everyday driving and towing.

• Rubber dust cover protects contacts from moisture and road debris
• 10A inline fuse included for circuit protection
• Extensive battery connection wire for secure power routing
• Zip ties help keep harness away from heat and moving parts

What comes in the Nilight 56349 package and what tools are needed?

The kit ships with the custom 4-pin harness, mounting hardware, routing supplies, and a fuse so you have everything required for a standard install. Most installations require only basic hand tools and take under an hour for someone comfortable with under-bumper routing and panel access.

• Custom 4-pin trailer wiring harness (vehicle-specific)
• 9 zip ties, 1 screw, 10A fuse, and extensive battery connection wire
• Simple hand tools (screwdriver, pliers, wrench) typically sufficient
• Instructions recommend accessing wiring behind taillight housings

Who this is for: Pickup owners with a 2016–2023 Toyota Tacoma who want a clean, reversible way to add standard trailer lighting. Ideal for drivers who tow light-duty trailers and prefer an OEM-compatible, no-cut installation with weather protection and included hardware for a tidy, reliable setup.