Trailer Light Wiring Harness 4 Flat 40ft to re-wire Trailer Lights

This 40 ft Boat Trailer Wiring harness will replace your old or worn out trailer wiring to make it like new again! The Trailer End Connecter on this Wiring Cluster uses a 4 pin or 4 flat connector.  This Harness uses color coded wires to send power to your trailer's lights and brake functions.  The Colors are the same White, Green, Yellow, and Brown wires that all trailer harnesses use. The Functions of these wires are as follows: White (Ground Wire), Green (Right Turn), Yellow (Left Turn), and the Brown Wires Operate the Left and Right Side Running Lights.

A 4 Pin Wiring Harness is typically used on a trailer without brakes, or a Trailer with Electric Brakes.  If you have hydraulic disc brakes, you would typically need a 5 pin connector.  We have a similar 5 Flat Wiring Harness available on our website at this link for those occasions.

This 35ft length is perfect for longer trailers, or those wanting to wire their trailer up all the way to a set of lights at the top of their Boat Trailer Guide Poles.  Each wire is 35ft long, including the 2 White Ground Wires which is about 30 inches long each, and is designed to install to the trailer tongue, closer to the tow vehicle end of the trailer.  

This Wiring Harness is a 'wishbone' style harness, which means that it's designed to send (1) brown wire, and (1) yellow wire down the left side of your trailer frame, and (1) brown wire and (1) green wire down the right side of your trailer frame to make installation easier and more straight forward.

Features:

- 40ft length on the main lighting wires (Brown, Green, & Yellow)

- 30 inch length for the White Wire.

- Wishbone Style Harness for Easier Installation

- 4 Pin Connector, also called a 4 Flat Connector.