汽车电气设备使用直流电,一般汽车电路都采用单线制,目前绝大多数汽车是负极搭铁,即蓄电池正极线直接与各用电设备连接,蓄电池负极线直接搭在车架上,用电设备的负极线搭在车架等金属机件上,利用发动机和汽车底盘等的金属体作公共通道,这种负极线与车体相连接的方式 Automotive electrical equipment using DC, the general automotive circuits are used single-wire system, the vast majority of the current car is the negative ground, that is, the battery positive cable directly connected with the various electrical equipment, battery negative line directly on the frame, the electrical equipment Negative line ride on the frame and other metal parts, the use of the engine and car chassis and other metal body for public access, the negative line and the body connected to the way