
Automotive wiring systems generally adopt a single-wire configuration. When connecting the grounding wire, it is best to follow these points: 1. In-car electrical devices are usually connected only to the positive terminal, while the negative terminals are connected to the vehicle body. The battery negative grounding wire, the grounding wire connecting the engine to the vehicle body, and the main circuit grounding wire form a parallel network for numerous electrical devices in the car circuit. These grounding wires transmit current to ensure the effective operation of automotive electrical components. 2. The main grounding wire typically has a thicker gauge, and special-shaped grounding terminals, washers, and fastening screws are used at both ends of the grounding wire. Special considerations are also given to component wiring. 3. There must be a closed loop between working components. The return wire leads back to the battery's negative terminal, forming a cycle that enables electrical devices to perform various actions and functions. Most wires in a car originate from power sources, and the return wires of various electrical actuators do not all go directly to the battery's negative terminal. Instead, they indirectly return to the battery's negative terminal through the vehicle's metal structure.


