4-Pin Trailer Wiring Harness Fit for Toyota Tacoma 1996-2004

Part Number: 55379Fitment: fit for Toyota Pickup 1989-1995 (Excluding 1993-1995 T100), fit for Toyota Tacoma 1996-2004 (Excluding 1995 Mid-Year model)Type: 4-Pin Trailer Wiring HarnessPlacement on Vehicle: RearFitment Type: Direct ReplacementColor: BlackMaterial: PVC, Tin-Plated Copper TerminalsConnector Type: 4-Way Flat T-ConnectorPackage Included: 1Pcs 4-Pin Vehicle-Side Trailer Wiring Harness with Cover

• FITMENT CONFIRMATION: Fit for Toyota Tacoma 1996-2004 (all cab configurations: Regular Cab, Xtracab, Double Cab; all trims: Base, Pre-Runner, SR5, Limited, S-Runner), Fit for Toyota Pickup 1989-1995 (all trims). Excludes 1993-1995 Toyota T100 and 1995 Mid-Year Tacoma models. This is a vehicle-side 4-way flat trailer wiring harness that connects to the rear tail lamp wiring on the driver side of the vehicle. The 4-way flat connector provides ground, tail/running, left turn/brake, and right turn/brake circuits to power a trailer's lighting system. Verify your model year and confirm your vehicle is not a T100 before ordering.
• PART NUMBER COMPATIBILITY: Replaces 55379. This T-connector wiring harness plugs directly into the existing tail lamp wiring harness connector on the Fit for Toyota Tacoma and Fit for Toyota Pickup without cutting, splicing, or modifying any factory wires. The harness includes a vehicle-side connector that matches the factory tail lamp plug and a 4-way flat output socket that accepts any standard 4-way flat trailer plug. The tin-plated copper terminals inside the connectors provide reliable electrical contact and conductivity for all four circuits (ground, tail, left turn/brake, right turn/brake). Verify part number 55379 matches your vehicle before ordering.
• ENGINEERED FOR RELIABILITY: The wiring harness is constructed with bonded multi-strand copper wire insulated in PVC jacketing for flexibility and abrasion handling in the underbody environment. Each terminal connection uses tin-plated copper contacts that maintain reliable conductivity over repeated connect/disconnect cycles with the trailer plug. The T-connector design taps into the existing tail lamp circuit without adding any load converters or relay modules — the Fit for Toyota Tacoma and Pickup use a standard incandescent tail lamp system that can directly power trailer lighting through this 4-way flat harness without signal interference or flickering.
• CONFIDENCE IN YOUR PURCHASE: Common reasons for installing a 4-way flat trailer wiring harness on the Fit for Toyota Tacoma/Pickup: (1) Tow a utility trailer, boat trailer, or cargo trailer that requires tail, brake, and turn signal lighting. (2) Replace a damaged or corroded factory trailer connector that no longer makes reliable contact. (3) Add trailer wiring capability to a vehicle that was not originally equipped with a trailer connector. (4) Upgrade from a temporary clip-on wiring solution to a dedicated plug-and-play T-connector that integrates with the factory tail lamp harness. (5) Pass state vehicle inspection that requires functional trailer lighting connections.
• SIMPLE PLUG AND PLAY INSTALLATION — NO WIRE CUTTING REQUIRED: Step 1: Locate the tail lamp wiring harness connector behind the driver-side tail lamp housing. Step 2: Disconnect the factory tail lamp plug from the tail lamp assembly. Step 3: Plug the T-connector vehicle-side connector into the tail lamp assembly socket. Step 4: Plug the factory tail lamp plug into the T-connector pass-through connector. Step 5: Route the 4-way flat output socket to your preferred mounting location near the rear bumper or hitch area. Step 6: Snap the rubber cover onto the 4-way flat socket when not in use to keep terminals clean. Total install time: under 15 minutes.