NOVELTY - The system has first generator driven with drive shaft of engine. Second generator is driven with transmission shaft. Electricity supply systems are provided with electrical wirings to supply electricity from first charger to electrical component, and from second charger to first charger. The switches are respectively provided in wirings between second generator and second charger, and between second charger and first charger. Electric control apparatus is used to perform start time control of auxiliary machine of engine driven with electric power from second charger.    USE - Power source system for vehicle (claimed) such as motor vehicle such as truck. Can also be used in automatic-transmission vehicle such as automatic-transmission car, and manual transmission (MT) vehicle.    ADVANTAGE - The power source system for motor vehicle can reduce the auxiliary machine driving torque of an internal combustion engine at time of increase in the charging capacity of the chargers, and at time of start of a vehicle. The overdischarge of the battery can be prevented by efficiently performing electric power generation and charging operations. The operation of the internal combustion engine with inadequate charge condition of the desired charger is avoided. The deterioration of the fuel consumption of the vehicle can be suppressed, by using the power source system for the vehicle.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an electric supply method of the vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating the electric power supply process of the vehicle. (Drawing includes non-English language text)    Step for supplying electricity by controlling idle stop start control time (S12)    Step for determining whether vehicle is in normal driving condition (S13)    Step for turning ON first switch (S15)    Step for determining whether throttle-opening is more than predetermined judgment value (S20)    Step for turning OFF switch for power generation (S21)