The main wiring harnesses inside the car are:
The commonly used specifications for wires in automotive wiring harnesses include wires with nominal cross-sectional areas of 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 4.0, 6.0 square millimeters (the nominal cross-sectional areas commonly used in Japanese cars are 0.5, 0.85, 1.25, 2.0, 2.5, 4.0, 6.0 square millimeters, etc.), each of which has an allowable load current value and is used for wires of different power consumption equipment.
Taking the whole vehicle wiring harness as an example, a 0.5 specification wire is suitable for instrument lights, indicator lights, door lights, roof lights, etc; The 0.75 specification line is suitable for license plate lights, front and rear small lights, brake lights, etc; The 1.0 specification line is suitable for turn signals, fog lights, etc; The 1.5 specification line is applicable to front headlights, horns, etc; Main power lines such as generator armature wires, grounding wires, etc. require wires of 2.5 to 4 square millimeters.
This only refers to general cars, where the key is to consider the maximum current value of the load. For example, the grounding wire and positive power wire of the battery are specialized car wires used separately, and their wire diameters are relatively large, at least more than ten square millimeters. These "giant" wires will not be included in the main harness.

Automotive wiring harness
It is the main body of the automotive circuit network, and without wiring harnesses, there would be no automotive circuit. A wire harness refers to a component that is made of copper material punched into contact terminals (connectors) and crimped with wires and cables, and then covered with plastic insulation or an external metal shell to form a connected circuit.
The wiring harness industry chain includes wires and cables, connectors, processing equipment, wiring harness manufacturing, and downstream application industries. Wiring harnesses are widely used and can be used in automobiles, household appliances, computers and communication equipment, various electronic instruments and meters, etc. The body wiring harness connects the entire body and has a general H-shape.
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