The situation is this, I would like to power a Delco 1 wire 100 amp alternator with a 3/4HP 12v DC motor, I would have an automobile battery to start the motor, and for the alternator to maintain, plus I would like to have enough power to run an additional 30 amps (max) of accessories. I can afford a slow drain on the battery, due to the fact I can charge it externally if needed, but I would like to limit how often an external charge source is needed. The motor I am looking at using draws 58 amps at full load, @ 1800 rpm. I realize I would have to gear the pulleys approximately 2 to 1. I am not sure if this is a possibility, or if this runs in to perpetual motion problems. I have laid out the switching needed to cut power to motor so that I don't run into a continuous loop problem. Thanks in advance for your replies.