What is the Difference Between a 4-Way and 7-Way Trailer Connector? Sep 27, 2022

A 4-way trailer connector has basic lighting features; Running lights, left turn signals and brake lights, right turn signals and brake lights, and ground.

4 way trailer plug

A 7-way trailer connector has these functions and a 12-volt circuit, an electric trailer brake circuit (which requires a brake controller on board), and a reverse light or auxiliary power circuit.

7 way trailer plug



Wiring diagram of 4-way trailer plug


Following the standard method of wiring trailer connectors is essential to the safety of your vehicle while towing. Connecting wires of the wrong color can lead to mismatched taillights and road chaos. 

4 Way Flat Trailer Side Trailer Wiring Color Code 4P tralier connector

Use this 4-pin wiring diagram to properly connect your 4-wire trailer plug.


Green Right turn / brakes
Yellow Left turn / brakes
Brown Taillights
 White Ground


There are other types of connectors. We will continue to update articles on connectors, wires and cables, and wiring harnesses.


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