Connectors are often in two sections of wires, and are also used for the connection between two active devices. They have various forms and structures, but are usually composed of contacts, insulating parts, housings, and accessories. The contact piece is the core part of the connector to complete the function, which completes the electrical connection through the insertion of the female and male contact pieces; the shell is the outer cover of the automobile connector, providing mechanical protection and fixing the function of the connector; the function of the insulator is to Arrange the contacts in the specified position and spacing, and provide insulation protection.