if you look at stanley meyers. youtube you will see that there is a alternator on there bench. if you know about them you take the diodes and regulator out of it. and you have ac from dc. but you need a pwm to bring down and control the voltage. you can put 2 or 3 alt. on your car. but you only need one to do the job. if you look at cars with cb equipment or ham you will see alt. on there car high volts low amps but to test this on your bench you need one hooked up to a motor