When I was involved with Drag racing there was a young guy who wanted to build a quick street car.
He figured on saving power by not running the fan, water pump or alternator from the crank.
He wanted to run an electric motor driving the fan, water pump and alternator, the alternator would then charge the battery which would in turn power the motor driving the whole lot ad infinitum.
He could not understand why it would work, I told him if he could get it to work he would be the richest man in the world