Learn how to wire a 4-way trailer connector with our detailed diagram. Step-by-step instructions and illustrations to ensure a proper and safe connection.. Learn how to wire a 4-way connector trailer with this detailed diagram. Understand each pin's function and make trailer wiring simple and clear.
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4-Way Connectors 4-Way connectors are available allowing the basic hookup of the three lighting functions (running, turn, and brake lights) plus one pin is provided for a ground wire. Most standard light duty trailers will use a 4-pole flat connector.. Complete trailer wiring diagrams for 7-pin, 6-pin, 5-pin and 4-pin connectors. Wire color codes, gauge chart and step-by-step hookup guide for every trailer plug type.