1. power supply circuit: it consists of storage battery, generator, voltage regulator and working condition display device. Its main task is to supply power for all electrical equipment of the vehicle and keep the power supply voltage stable.
2. Starting circuit: It consists of starter, starting relay, starting switch and starting protection device, and its main task is to change the engine from static state to self-running state.
3. Ignition circuit: It consists of distributor, electronic ignition controller, ignition coil, spark plug and ignition switch. Its main task is to control and generate enough voltage to break through the gap between spark plugs, and at the same time, to deliver high-voltage electricity to spark plugs of each cylinder according to the working sequence of the engine.
4. Air conditioning control circuit: It consists of air conditioning compressor electromagnetic clutch, air conditioning controller, control switch and fan control circuit.
5. The instrument loop consists of instruments, indicators, sensors, various alarms and controllers. Its main task is to control all kinds of instruments to display information parameters and alarm.