CURT 4-Pin Trailer Wiring Harness for Toyota 4Runner — Vehicle-Side Plug-In, No Splicing

CURT 55341 is a vehicle‑specific, plug‑and‑play 4‑pin trailer wiring harness that connects your Toyota 4Runner’s taillights to a standard 4‑way flat trailer connector without cutting or splicing.

If your 4Runner didn’t come prewired for towing, this CURT custom T‑connector provides a clean, OEM‑compatible way to add trailer wiring. Designed to match factory connectors, the harness uses vehicle‑specific plugs that mate with your taillight assembly and delivers a 4‑way flat socket for tail, brake, and turn signal functions. Included components and a dust cover help protect the connector when it’s not in use, while SMT circuitry improves durability and electrical performance compared with generic adapters.

How does this harness install on my Toyota 4Runner?

Installation is a simple plug‑in process that requires no cutting, soldering, or wire splicing. You access the vehicle’s taillight connectors, unplug the factory plugs and insert the CURT T‑connector between the vehicle wiring and the taillights. The result is a secure, factory‑style connection that retains vehicle wiring integrity and makes removal straightforward if needed.

• Vehicle‑specific OEM‑compatible connectors for direct plug‑in installation
• No cutting, splicing, or soldering required
• Includes mounting hardware and dust cover for the 4‑way socket
• Reconnects quickly to restore stock wiring when towing isn’t needed

What lighting functions will the 4‑pin connector support?

The CURT 55341 provides the standard 4‑way flat output to operate trailer tail lights, brake lights, and turn signals. It uses an integrated tail light converter to ensure the vehicle’s separate lighting circuits work properly with the trailer’s unified wiring. This setup covers basic trailer lighting needs without adding extra circuits for electric brakes or auxiliary functions.

• Tail/running lights, stop lights, and left/right turn signals supported
• Built‑in converter aligns vehicle signals to standard trailer wiring
• Compatible with most trailers using a 4‑way flat plug

What makes CURT 55341 more durable than generic harnesses?

CURT builds this custom harness with SMT (surface‑mount technology) circuitry and vehicle‑grade materials to resist vibration and moisture common on the road. The harness includes protective sheathing and a dust cover for the 4‑way socket to reduce corrosion and keep contacts clean. Those design choices translate into longer life and fewer electrical issues over time compared with inexpensive, non‑specific adapters.

• SMT circuitry for reliable electrical performance and longevity
• Protective jacket and sealed connectors against road exposure
• Dust cover included to protect the 4‑way socket when idle

Will this harness work with my vehicle’s other trailer accessories?

The 55341 is intended to provide core lighting circuits via a 4‑pin flat connector and does not add circuits for features like trailer brakes, backup cameras, or 7‑way power. If you need supplemental functions, you will require additional modules or a different harness designed for those systems. Always check the application fit list to confirm compatibility with your model year and trim.

• Supports basic lighting only; no electric brake or 12V auxiliary power output
• Check CURT application details for model year fitment
• Can be paired with additional modules for expanded towing features

Who is this for: The CURT 55341 is aimed at Toyota 4Runner owners who want a fast, reliable way to add standard trailer lighting without altering factory wiring. It’s ideal for drivers who tow small trailers, boats, or cargo carriers and prefer OEM‑style installation, durability, and a tidy, removable solution rather than a universal splice kit.