An assembly structured to convert mechanical energy to electrical energy for a wheeled vehicle such as an automobile. A current generating assembly is mounted on the vehicle and an adaptor is connected between and in engaging relation with a vehicle wheel and a tire/rim assembly connected to the vehicle wheel. The adaptor includes a drive portion disposed in an accessible, partially exposed orientation relative to the vehicle wheel. A drive linkage, such as a drive belt, is disposed in driven relation to the drive portion of the adaptor and in driving relation to the current generating assembly. Rotation of the wheel during normal operation of the vehicle results in driving or powering of the current generating assembly and the generation of current to an electronic drive assembly of the vehicle and/or electrically powered components thereof, at least partially through the battery assembly associated with the vehicle.