ARIMDOTUL 35FT Trailer Wiring Harness 4-Way Flat 5-Wire Y-Split 16AWG Jacketed Cable for Left/Right Taillights

The ARIMDOTUL 35FT 4-pin 5-wire trailer wiring harness is a Y-shaped, jacketed 16AWG cable kit that lets you replace or extend trailer tail, brake and turn wiring for safer, more reliable lighting on boats, RVs and cargo trailers.

Whether you are rewiring an older trailer or adding length for a new tow setup, this kit supplies a long, durable run plus a short ground lead and a split Y that feeds separate left and right taillights. The harness uses 16AWG conductors in a PVC-jacketed cable rated for a wide temperature range and chemical resistance, and it terminates in a standard 4-way flat male plug to mate with common trailer sockets.

How does the 5-wire Y design make taillight wiring easier?

The Y-shaped cable separates the taillight circuit into two brown leads so left and right tail lights can be wired independently while maintaining shared power for running lights. This prevents shared circuits from failing both sides if one connection has an issue, and it simplifies matching factory-style wiring layouts on many trailers.

• Dual brown leads for left and right taillights
• Single 4-way flat plug for turn, brake, and running circuits
• 3FT ground wire included to reach chassis grounding points
• Color-coded wires for faster, low-error installation

Will the harness withstand outdoor trailer conditions?

The cable uses 16AWG conductors with a robust PVC insulation and outer jacket that resists oils, chemicals and oxidation, helping it hold up to marine and road exposure. The insulation is rated for temperatures from -22°F to 221°F and a cable voltage rating of 300V, providing resilience in fluctuating climates and typical towing environments.

• PVC jacket resists chemicals and UV exposure
• Temperature-rated from -22°F to 221°F for all-season use
• 16AWG wire for lower resistance and steady current delivery
• Waterproof 4-way flat plug to connect to standard sockets

How simple is the harness to install on my trailer?

Installation is straightforward thanks to the color-coded conductors and a standard 4-way flat male connector that mates with most tow vehicle sockets. The long 35FT main cable offers flexibility in routing along frames, while the short ground lead reaches grounding points without splicing extra wire.

• Color-coded wires match common trailer wiring conventions
• 35FT length minimizes need for extensions or joins
• Plug-and-play 4-way flat male connector
• Y-split reduces complex splicing for left/right lights

What trailers is this harness compatible with?

This harness is designed for trailers that use a standard 4-way flat wiring system, such as many boat, ATV and cargo trailers. It is not intended for motorcycle trailers or systems that require a 5-pin, 6-pin, or RV-specific plug type without adapters.

• Compatible: boat trailers, ATV trailers, cargo trailers
• Not compatible: motorcycle trailers and non-4-way systems
• Works with standard 4-way flat sockets on tow vehicles
• Ideal for rewiring left/right taillights and brake circuits

Who this is for: the ARIMDOTUL 35FT 4-pin 5-wire harness is aimed at DIY trailer owners, marine and outdoor enthusiasts, fleet maintainers, and mechanics who need a weather-resistant, easy-to-route wiring solution for restoring or extending trailer lighting. If you want a long, color-coded cable with a Y-split for independent tail circuits and a rugged PVC jacket for harsh conditions, this kit is built to make rewiring faster with fewer parts.