What line system does the traditional car implement?

One-wire system means that in the automotive electronic system, only one wire is used to connect the power supply and electrical equipment, and metal bodies such as automobile chassis and engine are used as another common wire. One-wire system is widely used in modern automobile electrical system, because it saves wires, simplifies and clarifies the circuit, is convenient for installation and maintenance, and the electrical part does not need to be insulated from the body. However, under special circumstances, it is sometimes necessary to adopt the two-wire system.

Modern automobile wiring basically adopts single-wire system, that is, the wiring is connected to the motor with a single wire, and the frame grounding is another loop of the circuit. The advantage of single-wire system is that it can save wires and reduce line faults. Vehicle circuits are generally divided into several trunk lines centered on the ignition switch. Single-line electrical equipment is connected in parallel, and the negative electrode is grounded. The lines are colored and numbered.