It is referred to as such as the system needs a mere four wires for the trailer tail lights turn signals and brake lights to illuminate. They also provide the vehicle side connector too which i dont need as the tow vehicle already has that installed.

Wire Diagram For 4 Flat Connector Wiring Diagram
How to wire 4 way trailer lights. I believe there is about 25ft of wiring which should be plenty for a trailer of this size. 5 pin trailer wiring is very similar to 4 pin wiring but it adds in a blue wire for the reverse or backup lights. Wiring new 3 wire light on trailer to replace 2 wire light. Standard color code for wiring simple 4 wire trailer lighting. Wiring new 4 way connector on trailer with 5 wires. 6 way system rectangle plug.
You have it right so far the 4 way connector is just as you have stated. Well walk you through the wiring process its easier than you think. The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer snowmobile trailer or utility trailer. The 4 way system is designed so the right brake light wire and right turn signal are green. Learn step by step how to wire trailer lights in no time with this tutorial.
A 4 way plug connects your trailer and tow vehicle and provides the required running lights turn signals ground and brake lights. Wiring trailer lights can be a big task and you want to get it right. Trailer wiring harness recommendation for a 2007 chevy colorado. Not all trailers have reverse lights so consider your own trailer as you wire in a 5 way plug. Wiring configuration for trailer side marker lights. Though trailer lighting systems are available in an array of configurations the most popular is the 4 way system.
34 inch by 1 inch 6 way rectangle connectors right turn signal green left turn signal yellow taillight brown ground white. Remember that yellow has a l in it so that is the left side braketurn signal and green has a r in it so that is the right side braketurn signal. This is just a standard 4 way connector with a ground parking and signal or brake lights. Most of us arent electricians but that doesnt mean wiring a trailer or replacing corroded wiring is beyond us. How to install a 7 way trailer connector to add a 12 volt power lead to a trailer.