As agricultural machinery rapidly evolves toward intelligent and automated systems, modern equipment such as tractors, combine harvesters, and sprayers now incorporates dozens of sensors, actuators, and control modules. The transmission of power and signals between these electronic components relies on a reliable and durable electrical connection system—the agricultural equipment wiring harness. This article will systematically analyze the core characteristics, application equipment, selection methods, and risks of incorrect selection for agricultural equipment wiring harnesses, providing professional guidance for agricultural machinery manufacturers, maintenance technicians, and farm managers.