Nilight 4-Pin Trailer Wiring Harness for Toyota Tacoma 2016-2023 — Model 56349, Plug-and-Play with Dust Cap

The Nilight 4-Pin Trailer Wiring Harness Kit 56349 converts your 2016–2023 Toyota Tacoma’s factory wiring into a standard 4‑flat trailer connector for plug-and-play towing.

If you tow small trailers, cargo carriers, or utility trailers, this vehicle-specific harness adds a durable 4‑pole connector without cutting factory wires. Designed to mate with the Tacoma’s OEM taillight wiring behind the driver and passenger side taillight housings, the kit supplies the full set of parts you need for a clean, reversible installation and reliable trailer lighting operation.

How does this harness attach to my Tacoma?

The Nilight harness uses OEM-compatible plugs that insert into the factory wire harness behind each Tacoma taillight housing—no splicing required. You route the harness to the hitch and stow the 4‑flat connector below the bumper when it’s not in use.

• Direct-fit connectors for 2016–2023 Toyota Tacoma taillight sockets
• No cutting, soldering, or permanent modifications
• Includes zip ties and screw for tidy cable routing
• Mounts near the trailer hitch for easy access

What lighting functions does the 4‑pin connector support?

This standard 4‑flat plug carries taillight, brake light, and turn signal circuits plus a ground return—ideal for small trailers and basic towing needs. It does not provide a separate power circuit for trailer brakes or auxiliary power.

• Left and right turn signals
• Stop/brake lights
• Running/taillights and ground
• Compatible with most utility and cargo trailers

How weatherproof and durable is the connector?

The kit supplies a snug rubber dust cover that slips over the 4‑flat connector when unused, helping block moisture, dirt, and corrosion. The wiring and plugs are built to withstand normal road exposure when routed and secured properly.

• Tight-fitting rubber dust cap included
• OEM-style connector shells for secure mating
• Corrosion-resistant contacts when capped and maintained
• Designed for under‑vehicle mounting near the hitch

What comes in the package and what tools are needed?

The Nilight bundle includes the custom 4‑pin harness and basic installation hardware so you can complete the install with minimal tools. Most users need only a screwdriver, pliers, and a few minutes to route and secure the wiring.

• Custom 4‑Pin Trailer Wiring Harness (pre‑wired)
• Nine zip ties, one screw, and one 10A fuse
• Extensive battery connection wire for reliable power/ground
• No wire splicing; simple plug‑and‑play installation

Who this is for: This harness is made for 2016–2023 Toyota Tacoma owners who want a straightforward, reversible way to add a standard 4‑flat trailer connector for everyday towing—ideal for weekend haulers, small boat and utility trailer users, landscapers, and anyone who prefers a factory‑style installation without permanent wire modifications.