NOVELTY - The system has first (12) and second (14) batteries which power the standard and the auxiliary electrical systems, respectively, and which are normally electrically isolated from each other. Each battery has an associated alternator (18,20) that is powered from the engine and a manually activated switch (16) enables the batteries to be electrically coupled together in an emergency.    USE - For use in a motor vehicle, particularly a limousine.    ADVANTAGE - The system ensures that adequate power is supplied both to the standard electrical system, including the engine, blowers, engine ignition system, power locks, air conditioning etc., and to the auxiliary electrical system, which powers extra electrical equipment such as a stereo, lights, television, computers and other electrical items not found in a standard vehicle, without placing an undue burden on the main vehicle battery such that it becomes drain. Ensures that electrical power can be supplied to the extra electrical items, particularly when the vehicle is idling, and as both batteries are independently charged by different alternators, should one battery become flat the system can be used to supply power from the other battery.    DETAILED DESCRIPTION - The system has a first battery electrically connected to supply electric power for the operation of the engine and the standard electrical system of the vehicle and a second battery connected to supply power to the auxiliary electrical system. The first and second batteries are electrically isolated from each other during normal operation of the engine and a manually operable switching mechanism enables the two batteries to be coupled together in case of an emergency. A first alternator is driven by the engine and electrically connected to the first battery to recharge the first battery during operation of the engine, with the first alternator having a first drive shaft with a first pulley (24) attached to it. A second battery is connected to recharge the second battery and has a second drive shaft upon which a second pulley (26) is attached. A drive belt (28) is operatively connected to the first and second pulleys that when the first drive shaft is driven by the engine the drive belt is turned to drive the second alternator. The first and second alternators are electrically isolated from each other during normal operation of the engine and are positioned next to each other and connected together by an adjustment bracket. At least one of the alternators includes a mounting element that has one end mounted to a pivot and the other end connected to the adjustment bracket at a selected variable position which regulates tension in the drive belt, whereby the operation of the engine drives both the alternators simultaneously at the same speed, between 2000 and 9000 revolutions per minute. Each battery has a cold cranking ability of at least 550 amperes and a reserve capacity of at least 90 minutes.    DESCRIPTION OF DRAWING(S) - A schematic diagram of the electrical power generating system.    First battery (12)    Second battery (14)    Manually activated switch (16)    Alternators (18,20)    Pulleys (24,26)    Drive belt (28)