CZC AUTO 25FT 4-Pin 5-Wire Trailer Wiring Harness Kit – Pure Copper Core

Overview

The CZC AUTO 25FT 4-Pin 5-Wire Trailer Wiring Harness Kit is designed to simplify trailer rewiring while delivering dependable performance on the road. A generous 25-foot main length paired with a 2.5-foot ground lead provides flexible routing for many trailer layouts, reducing the need for splicing or extra wiring. The Y-Harness design routes power to both taillights in a single, tidy setup, keeping cables organized and reducing potential trouble spots during installation.

Color-coded conductors make it easier to identify brake lights, turn signals, and taillights, helping you wire with confidence even in dim workspaces or after a long day of use. Those who upgrade an older trailer or assemble a new setup can enjoy a cleaner loom and less tangled wiring as a result of thoughtful layout and high-visibility labeling.

Durable build you can rely on

• 18 AWG pure copper core for solid conductivity and stable signal transmission.
• Thick PVC jacket paired with a black nylon protective sleeve guards against moisture, abrasion, and corrosion.
• Rugged construction designed to stand up to regular road exposure and trailer flexing while keeping installation neat.

Length, fit, and compatibility

• 25-foot main length plus a 2.5-foot ground wire, suitable for trailers up to 80 inches wide.
• Works with standard 4-way flat sockets and is compatible with boat, horse, ATV trailers and other 4-way trailer systems.
• Includes a dustproof cap to shield the end when not in use, helping maintain a clean connection point.

Whether you are rewiring a boat trailer after a season of wear, upgrading an older setup for easier maintenance, or wiring a new trailer from scratch, this kit offers a practical balance of length, reliability, and ease of use. The combination of copper core, protective sleeve, and straightforward color coding helps you approach installation with clarity, while the durable materials support long-term performance under road conditions. Consider this harness as a potential element in a broader trailer maintenance or upgrade plan, keeping in mind that results can vary with environment, load, and use patterns.