The car wiring harness is the main body of the car circuit, and there is no car circuit without the wire harness. The wire harness refers to a component in which a contact terminal (connector) made of a copper material is crimped to a wire and cable, and an external insulator or a metal case is externally molded, and the wire harness is bundled to form a connection circuit. The wire harness industry chain includes wire and cable, connectors, processing equipment, wire harness manufacturing and downstream applications. Wire harness applications are widely used in automotive, household appliances, computer and communication equipment, various electronic instrumentation, etc. The general shape is H-shaped.