Aufind 35FT 4‑Pin 5‑Wire Trailer Wiring Harness — 18 AWG Color‑Coded, Weather‑Resistant Y‑Harness

The Aufind 35FT 4 Pin 5 Wire Trailer Wiring Harness is a full-length, color-coded trailer light kit designed to connect tail lights, brake lights and turn signals reliably without splicing extensions.

This 35-foot wishbone-style wiring harness combines 18 AWG pure copper conductors, thick PVC insulation and a braided nylon outer sleeve to give trailer owners a weather-resistant, flexible solution for rewiring or replacing an existing 4-way flat connector setup. The kit includes a male 4-flat plug, a Y-harness configuration with an extra ground run, and a small accessory pack so you can finish installations cleanly and quickly.

How does this harness simplify trailer lighting installations?

The Aufind harness uses a pre-made Y-configuration and color-coded wires so you avoid measuring and splicing long leads while on the trailer. Clear color assignments speed troubleshooting and reduce installation time for common trailer sizes.

• 35 ft main lead matches common trailer lengths for easy routing.
• 5-wire design includes a dedicated ground for improved signal reliability.
• Color-coded conductors follow standard trailer wiring colors for fast identification.
• Includes clip and connector accessories to secure wires and seal connections.

What materials protect the harness from weather and wear?

This kit pairs 18 AWG pure copper conductors with a thick PVC jacket and an outer braided nylon mesh. Those layers resist chafing, UV exposure and moisture, extending service life compared with bare or lightly insulated leads.

• 18 AWG pure copper for efficient current flow to lights.
• Thick PVC insulation to block abrasion and water ingress.
• Black braided nylon sleeve for extra abrasion and UV resistance.
• Solder-seal connectors included to create moisture-resistant joints.

Is this harness compatible with my trailer and vehicle connector?

The Aufind harness is intended for trailers and tow vehicles that use a 4-way flat (4-pin) connector interface. It supplies the standard lighting circuits — left, right, tail/running lights, and brake/turn combined — plus an extra ground run for more dependable grounding.

• Works with standard 4-way flat trailer plugs on trucks and towing vehicles.
• Not compatible with 7-pin round or motorcycle-specific wiring systems.
• Suitable for boat trailers, ATV trailers and utility trailers with 4-way plugs.
• Includes mounting clips to secure the harness along the trailer frame.

What comes in the box and how does it help a tidy installation?

The package contains the 35 ft male 4-flat lead, a 2.5 ft ground run, a Y-harness connector, and a small accessory kit to finish connections professionally. Having connectors and clips included reduces the need to buy extra parts and keeps the wiring neat and secure along the frame.

• 1 Y-harness connector pre-assembled for quick hookup.
• 6 plastic frame clips help anchor the harness to the trailer chassis.
• 6 solder-seal and 6 plastic wire connectors for sealed, reliable joins.
• Everything sized for straightforward routing and weather protection.

Who is this for? If you tow with a vehicle using a standard 4-way flat plug and need a durable, ready-to-install wiring solution for taillights, turn signals and brakes, the Aufind 35FT 4 Pin 5 Wire Trailer Wiring Harness is built to simplify rewiring, reduce corrosion points and give a weather-resistant connection. It’s suited to DIYers, fleet owners and anyone replacing a worn or damaged trailer lead who wants long reach plus reliable grounding without complicated splicing.