Automotive wiring harnesses electrical devices all rely on the wiring harness to transmit electrical signals

Automotive wiring harness grounding directly affects vehicle safety, in the car, the wiring harness is the central nervous system of the car, it is the car battery, a variety of signal distribution transmission carrier. Wiring harness in the whole vehicle electrical, plays an important role, all electrical equipment rely on the wiring harness to transfer electrical signals, realize the connection of the circuit. In the wiring harness design, grounding design is very important, in the early stage of wiring harness design need to fully consider the grounding design.
Grounding method, grounding location selection is not reasonable, will affect the realization of certain electrical functions, and even cause signal interference, etc., directly affecting the safety, reliability and stability of the vehicle use. At present, the majority of the world's automobile production of single-wire system negative grounding, is the use of automobile engines and chassis, body and other metal parts as a variety of electrical equipment common connection line, the battery and the negative pole of the electrical equipment through the wiring harness, bolts, nuts, and the chassis, the body of the metal frame is fastened together with the body itself instead of the wire, so that the electrical equipment to the battery only needs to be set up a wire. The current starts from the positive terminal of the battery, flows into the power equipment through the wire, and then flows back to the negative terminal of the battery through the metal frame to form a circuit.
The use of single-wire system negative grounding not only saves material, and makes the circuit more simplified, easy to assemble, maintenance. In the electronic and electrical systems of a car, the grounding point means a common reference point. The voltage difference between each grounding point and the negative terminal of the battery and between each grounding point should theoretically be 0V, but in practice it is impossible to do so.

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