Automobile wiring harness is the main body of the network of automobile circuits. Without wiring harness, there is no automobile circuit. The harness refers to the components that are formed by pressing the contact terminals made of copper and crimping the wires and cables, and then molding and pressing the insulators or adding metal shells to form the connecting circuit with the harness. The harness industry chain includes wires and cables, connectors, processing equipment, harness manufacturing and downstream application industries. The harness is widely used in automobiles, household appliances, computers and communication equipment, various electronic instruments and meters, etc. The body harness connects the whole body, and the overall shape is H-shaped. The common specifications of the wires in the car harness are the nominal cross-sectional area, and each has the allowable load current value, which is used for the wires of different power electrical equipment.