By car, two power supply - battery and the generator. Battery used when starting the engine and for supplying an electric current voltage of 12 V starter and other consumers with the engine off. When the engine is running, the main source of current - Generator - enables an electric shock all consumers, including the ignition system, and charges the battery.
If the dash warning light discharge of the battery (see.
Fig. 1.7, pos. 15), then no current flows from the generator to the onboard network and the amount of energy consumed battery. Operating a vehicle with a burning warning light battery discharge is unacceptable, as is sometimes the cause of tanning lamps can be short-circuited the wiring, resulting in a fire in the engine compartment of the car. Stop the car, stop the engine and set, which led to the failure to fire the lamp.