Nilight 4 Pin Trailer Wiring Harness Kit Compatible with 1989-2004

In this review of the Nilight 4 Pin Trailer Wiring Harness Kit, the bottom line is simple: this is a practical, vehicle-specific solution for owners of 1989-1995 Toyota Pickup (except T-100 or Tacoma) and 1995-2004 Toyota Tacoma who need a reliable, standard 4-way connector without cutting factory wiring. The reviewer found the harness to be straightforward to install, with OEM-compatible plugs and a durable dust cover, making it the best choice for DIYers who want a clean, reversible trailer wiring installation and a standard connector ready for common trailers.

Key Features

• Vehicle-specific fit: Designed to plug into the factory wiring for 1989-1995 Toyota Pickup and 1995-2004 Toyota Tacoma, so alignment and connector fit are predictable.
• Standard 4-way connector: Provides tail light, brake and turn signal functions on a common 4-flat plug that stows near the hitch when not in use.
• Plug-and-play installation: Uses OEM-compatible connectors that attach behind the taillight housings, removing the need to cut or splice factory wires.
• Weather protection: Includes a tight-fitting rubber dust cover to keep moisture and dirt out of the 4-way connector when it is not connected to a trailer.
• Complete kit: Ships with the custom 4-pin harness, nine zip ties, one screw and a 10 A fuse to finish the mounting and basic protection tasks.

Who It's For

This harness is aimed at Toyota Pickup and Tacoma owners who tow occasionally and prefer a factory-style, reversible installation. It suits DIYers who want a standard 4-way flat connector to tow small trailers, utility trailers, or boat trailers that use tail, brake and turn signals on a single plug.

It is less appropriate for drivers who need a 7-way connector, wiring for electric trailer brakes, or vehicle models outside the stated years. Also, those requiring heavy-duty commercial towing electrical features should look for dedicated multi-function kits.

Pros & Cons

Pros

• Direct OEM-compatible plugs make installation quick and keep the factory wiring intact.
• Standard 4-flat connector covers the common trailer lighting needs for most small trailers.
• Includes practical accessories like zip ties, a screw and a 10 A fuse to complete the installation neatly.
• Dust cover helps extend connector life by protecting against weather when not in use.

Cons

• Limited to a standard 4-way circuit, so it does not provide power for trailer brakes, 12 V feed, or auxiliary functions.

Specifications

Compatible Vehicles	1989-1995 Toyota Pickup (except T-100), 1995-2004 Toyota Tacoma
Connector Type	Standard 4-flat trailer connector
Installation	Plug and play, no cutting or splicing
Included Accessories	Zip ties (9), screw (1), 10 A fuse
Weather Protection	Rubber dust cover for 4-way connector
Functionality	Tail lights, brake signal lights, turn signals

Our Verdict

The Nilight 4 Pin Trailer Wiring Harness Kit is a sensible, cost-effective way for compatible Toyota Pickup and Tacoma owners to add a standard 4-way trailer connector without modifying factory wiring. It delivers straightforward installation, necessary mounting hardware and a protective dust cover, making it a good-value option for light towing and occasional trailer use.

Frequently Asked Questions

Will this harness fit my Tacoma?
It fits 1995-2004 Toyota Tacoma models and 1989-1995 Toyota Pickup models except T-100, using OEM-compatible connectors behind the taillights.

Do I need to cut my factory wires?
No, the harness is plug-and-play and installs using the factory connector locations without cutting or splicing.

Does it support trailer brakes or 12 V power?
No, the 4-flat connector provides tail, brake and turn signals only and does not include a dedicated 12 V feed or electric brake circuit.