Oyviny 4-Pin Trailer Wiring Harness for 2013–2018 Toyota RAV4 / 2013–2017 Avalon — Pure Copper & Powered Module

Oyviny's Custom 4-Pin Trailer Wiring Harness 56350 adds a plug-and-play 4-flat trailer connector to compatible 2013–2018 Toyota RAV4 and 2013–2017 Toyota Avalon models using pure copper wiring and a powered module.

If you need a reliable way to power trailer tail lights, turn signals and brake lights from your Toyota RAV4 or Avalon, this harness gives you a factory‑style 4-way connector without cutting into car wiring. The kit uses a powered control module that connects to your vehicle battery for clean, stable 12V power and includes dust caps and a fuse holder to protect the electronics. It’s built for durability with ABS housing and pure copper conductors for efficient current flow.

Will this harness fit my Toyota RAV4 or Avalon?

This harness is designed specifically for 2013–2018 Toyota RAV4 and 2013–2017 Toyota Avalon models. It plugs into the vehicle’s existing trailer wiring port where available and routes a hot lead to the battery to supply the 4-flat connector.

• Model coverage: 2013–2018 RAV4, 2013–2017 Avalon
• Direct plug-in to factory wiring—no splicing required
• Requires running a hot lead to the car battery for module power
• Includes 10A fuse in inline fuse holder for electrical protection

How hard is it to install this 4-way trailer connector?

Installation is straightforward for anyone comfortable with basic vehicle wiring and battery connections. The harness plugs into the car wiring harness and the module connects to the battery, eliminating the need to splice vehicle wires while providing a protected power source for towing lights.

• Plug-and-play interface with factory connectors
• Inline fuse holder with included 10A fuse for safety
• Rubber dust caps protect connector and fuse from moisture and dirt
• Clear wiring routes and mounting points for a tidy installation

What materials and protections are included?

The harness uses pure copper conductors to maximize conductivity and reduce voltage drop at trailer lights. The powered module’s housing is ABS plastic for impact resistance and long-term durability, while rubber dust covers shield exposed electrical points from contaminants.

• Pure copper wires for reliable signal and power transfer
• ABS high-strength module housing resists wear and vibration
• Dust caps on both the 4-flat connector and fuse holder prevent corrosion
• Included fuse protects vehicle and harness from electrical faults

What can I expect from the 4-way connector in everyday towing?

The standard 4-flat output supports most small to medium trailers by supplying running lights, left/right turn signals and brake lights. It’s a widely compatible connector type for cargo trailers, utility trailers and small boat trailers that don’t require a charging or brake circuit.

• Supports tail lamps, brake lights and turn signals via 4-flat wiring
• Works with a broad range of trailers using the 4-pin flat standard
• Powered module reduces load on vehicle circuits for stable operation
• Dust-protected connector resists road grime and moisture

Who is this for: Drivers of compatible Toyota RAV4 and Avalon models who want a clean, durable, no-splice tow wiring solution. It’s best for owners installing a 4-flat trailer connector themselves or by a technician who prefers a battery-powered module for better electrical stability. Choose this harness if you value pure copper wiring, protective dust covers, and an inline fuse for added safety during routine towing and light hauling.