1. Car harness. The main harness of the whole vehicle is usually composed of engine (ignition, electronic injection, power generation, starting), instrument, lighting, air conditioning, auxiliary electrical appliances, etc. According to different purposes, positions and functions, the main harness is divided into many branch harnesses.

The main harness of the whole vehicle generally takes the instrument panel as the core part, extends forward and backward, and runs through the distribution of the whole vehicle. Generally, it can be divided into head harness (including instrument, engine, headlight assembly, air conditioner, battery), tail harness (tail lamp assembly, license plate lamp, high-mounted brake lamp, trunk lamp), roof harness (door, ceiling lamp, audio horn), etc.

2. Car air conditioning harness. Take the whole vehicle harness as an example: 0.5mm2 wire is applicable to instrument lamp, indicator lamp, door lamp, ceiling lamp, etc; 0.75mm2 specification line is applicable to license plate lamp, front and rear small lamp, manufacturing lamp, etc; 1.0mm2 specification line is applicable to turn signal lamp, fog lamp, etc; 1.5mm2 specification line is applicable to headlamp, horn, etc; The specification above 10mm2 is suitable for the engine.

3. Car switch harness. In order to facilitate identification and error correction, each end of the harness is usually marked with symbolic numbers and letters to indicate the connection object of the wire. When the operator sees the symbols on the harness, he can correctly connect to the corresponding wires and electrical equipment. This sign is convenient for repairing or replacing the harness. In addition, using the same wire color to distinguish the same circuit is also a simple sign.

4. Car lamp harness. According to the different parts used on the harness surface, the materials and binding methods used are also different: due to the harsh working environment, the engine harness is usually subject to long-term high temperature, wind and sun, rain, strong turbulence and other special environments, and the threaded pipe with high flame retardance, good water resistance and high mechanical strength is generally used for binding during design. The working environment of the front cabin line of the car is also poor. Most branches are wrapped with threaded pipes with good flame retardance, and some branches are wrapped with PVC pipes. The working space of the instrument line is small and the environment is relatively good, so the method of full tape wrapping or flower tape wrapping is adopted. The working space of door line and roof line is small, which can be wrapped with adhesive tape, and some branches can be wrapped with industrial plastic cloth; The thinner roof line can be directly adhered to the vehicle with sponge tape. Because there are many parts where the chassis wire contacts with the body, it is wrapped with corrugated pipes to prevent the harness from being worn.