An electric generator includes a wheel coupled to an axle of a vehicle which includes battery. A rotator is fixedly mounted to the wheel and includes a series of magnets positioned so that the north pole of one magnet abuts the south pole of an adjacent magnet.A wheel mounted hub containing an electrical generator which is pivotally supported in arms of a yoke. The yoke and generator have an offset center of gravity, tending to give the yoke and generator a pendulum-like behavior within the housing. During wheel rotation, the generator tends to remain along a gravitational line of force, forcing a small wheel associated with the generator to turn against the hub. Around the outer periphery of the yoke, yet within the hub housing, is a circuit board which carries a power utilization circuit, so that the electrical path between the generator and the utilization circuit is very short. The circuit board may carry auxiliary circuits such as a current limiter, a generator disengaging circuit, a daylight deactivating circuit and a circuit for allowing operation regardless of direction of rotation
