Before arranging the Wiring Harness, draw the wiring harness diagram in advance. The wiring harness diagram is different from the circuit schematic diagram. A circuit schematic diagram is an image that expresses the relationship between various electrical parts. It does not reflect how electrical components are connected to each other, and is not affected by the size and shape of each electrical component and the distance between them. The wiring harness diagram must take into account the size and shape of each electrical component and the distance between them, and also reflect how the electrical components are connected to each other.

After the technicians of the wiring harness factory make the wiring harness wiring board according to the wiring harness diagram, the workers cut and arrange the wiring according to the regulations of the wiring harness board. The main wiring harness of the vehicle is generally divided into engine (ignition, EFI, power generation, starting), instrumentation, lighting, air conditioning, auxiliary electrical appliances, etc. There are main wiring harnesses and branch wiring harnesses. A vehicle main harness has multiple branch harnesses, just like tree poles and branches. The main wiring harness of the whole vehicle usually takes the instrument panel as the core part and extends front and rear. Due to length relationship or convenient assembly, the wiring harness of some cars is divided into front wiring harness (including instrument, engine, headlight assembly, air conditioner, battery), rear wiring harness (tail light assembly, license plate light, trunk light), canopy Wiring harness (doors, dome lights, audio speakers), etc. Each end of the wiring harness will be marked with marked numbers and letters to indicate the connection object of the wire.

The operator can see that the marking can be correctly connected to the corresponding wires and electrical devices, which is especially useful when repairing or replacing the wiring harness. At the same time, the color of the wire is divided into single-color wire and double-color wire, and the use of the color is also stipulated, which is generally a standard customized by the car factory. my country's industry standard only stipulates the main color. For example, it stipulates that the single black is dedicated to the ground wire, and the red single color is used for the Power Cable, which should not be confused.

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