Abstract: An electric motor alternating power supply for vehicles to replace gas-fueled engines, wherein the power supply includes an electric motor having a transmission mounted thereto, the motor being operated by two alternating power circuits, each having a battery that is alternately charged and discharged in a regulated sequential order by a sensing voltage relay which activates a secondary relay between an open and a closed mode of operation; thus, while one circuit is operating the electric motor from its associated battery, the other circuit allows its associated battery to be recharged.