Seachoice 4-Pole Flat Trailer Connector Set – Car & Trailer Side, 12" Leads (50-13871)

Overview

The Seachoice 50-13871 4-Pole Flat Trailer Connector Set includes both the vehicle-side and trailer-side connectors in a single package, making it a complete solution for installing or replacing a 4-flat trailer wiring connection from scratch. Each connector features a shrouded design for a secure, protected mating connection, and both sides come with 12-inch color-coded lead wires for straightforward wiring to the vehicle harness and trailer lighting circuits.

Features

• Complete set — includes both car-side (vehicle) and trailer-side connectors
• 4-pole flat connector configuration (standard 4-flat)
• Shrouded connector design for a secure, protected connection
• 12-inch color-coded lead wires on each side for easy wiring identification
• Compatible with 6V, 12V, and 24V electrical systems
• Suitable for boat trailers, utility trailers, and other light-duty trailer applications

Best Use Cases

• Installing a new 4-flat trailer wiring connection on a vehicle and trailer that have no existing connector
• Replacing a corroded, damaged, or missing 4-flat connector set on an existing trailer or tow vehicle
• Rewiring a boat trailer's lighting harness with a fresh, matched connector pair

What’s Included

• 1x car-side (vehicle) 4-pole flat connector with 12" color-coded lead wire
• 1x trailer-side 4-pole flat connector with 12" color-coded lead wire

Connector Compatibility

• Connector type: 4-pole flat (4-flat)
• Lead length: 12 inches per side
• Voltage compatibility: 6V, 12V, 24V
• Circuits supported: Left turn/brake, right turn/brake, running lights, ground

Related Trailer Connector Products

• Seachoice 7-Way to 4/5-Way Compact Trailer Connector Adapter (50-13811)
• Seachoice 7-Way Round to 5-Way Flat Cable Adapter – 18" (50-13821)
• Seachoice 7-Way to 4/5-Way Trailer Connector Adapter – 8" Lead Wire (50-13831)
• Seachoice 2-Pole Inline Wire Connector – Male/Female, 12" Lead (50-13841)

Parts Desk Insights

Best Use Case: This set is the correct recommendation when a customer needs to install a 4-flat connection from scratch on both the vehicle and trailer — rather than just replacing one side. It eliminates the need to source the car-side and trailer-side connectors separately, and the color-coded leads simplify wiring for customers doing their own installation. Most commonly used when rewiring an older boat trailer or adding a 4-flat outlet to a vehicle that has no existing trailer connector.

Fitment Note: This is a 4-flat set only — it does not include a 5-flat or 7-way connector. If the customer's vehicle already has a 7-way outlet and they need to connect to a 4-flat trailer, recommend the Seachoice 7-Way to 4/5-Way Adapter (50-13811) instead of rewiring.

Installation Note: The 12-inch leads on each side are intended for splicing into the vehicle harness and trailer wiring. Confirm the customer has the appropriate wire connectors, heat-shrink terminals, or solder for a weatherproof splice — especially for trailer wiring that sees regular submersion at the boat ramp.