CURT 4-Way Trailer Wiring Harness for Ford Ranger & Mazda B-Series — Vehicle-Side Plug‑In 55325 with Dust Cover

CURT 55325 is a vehicle-specific, plug-and-play 4-way flat trailer wiring harness that installs at the taillight assembly to provide reliable tail, brake and turn signal connections for select Ford Ranger and Mazda B-series trucks.

If your truck didn’t come pre-wired for towing, the CURT 55325 custom wiring harness gives you a fast, OEM-compatible way to add standard 4-way trailer power without cutting or splicing factory harnesses. Designed to match select model years of the Ford Ranger and Mazda B2300, B3000 and B4000, this T-connector uses vehicle-specific connectors that plug into the taillight sockets and delivers a dust-covered 4-way flat outlet ready for trailers, lights and small accessories.

Will this harness fit my Ford Ranger or Mazda B-series?

Compatibility depends on the model year and factory wiring layout of your truck. The CURT 55325 is built to plug into the original taillight assembly on specific years and trims; always verify fitment against the application list or your vehicle’s wiring before purchasing.

• Designed for select Ford Ranger and Mazda B2300/B3000/B4000 models
• Vehicle-specific OEM-style connectors for direct plug-in installation
• Check CURT application guide or your dealer for exact year/trim compatibility

How difficult is installation and what tools will I need?

Installation is straightforward since the harness uses plug-in connectors that mate with the factory taillight sockets—no cutting, splicing or soldering required. Most installations can be completed with common hand tools and minimal mechanical experience; instructions and all wiring components are supplied with the harness.

• Plug-and-play T-connector design—no wiring modifications to the vehicle
• Includes tail light converter and all necessary wiring components
• Typical tools: screwdrivers, panel trim tool and basic wrenches for access panels

What electrical functions and protection does the CURT 55325 provide?

The harness supplies standard 4-way flat output to control trailer tail lights, turn signals and brake lights via your vehicle’s lighting circuits. An integrated tail light converter ensures compatibility between the truck’s electrical signals and the trailer wiring, and a dust cover helps protect the connector when it’s not in use.

• 4-way flat socket for tail, brake and turn signal circuits
• SMT circuitry for stable performance and increased durability
• Dust cover included to keep contacts clean and reduce corrosion risk

Will this harness handle additional trailer accessories?

The CURT 55325 is intended for standard lighting functions on trailers. It supplies the lighting circuits reliably, but for high-current accessories (electric brakes, winches, auxiliary power) you may need a separate powered or 7-way wiring solution to supply dedicated power and braking control.

• Meant for lighting circuits and basic trailer connectivity
• Not engineered for heavy-duty power delivery to accessories or brake controllers
• Consider a 7-way or powered converter for electric brakes or high-draw devices

Who is this for: The CURT 55325 is ideal for owners of compatible Ford Ranger and Mazda B-series trucks who want a clean, factory-like trailer wiring solution without modifying factory wiring. It suits weekend boat or utility trailers and drivers who prefer a quick plug-in installation and OEM-style reliability; if you plan to tow trailers requiring electric brakes or high-power accessories, look for a powered or multi-pin option instead.