heres an idea. the alternator is controlled by voltage. if we have an alternate charge source to the alternator then the voltage will go high and the alternator will switch off eliminating parasitic load. all we need is a big 110v battery and a charger. we can control the rate of charge with a resistor (light bulb) in series with the car battery or the internal resistance of the battery itself. we don't even have to supply all the amps -if the voltage drops the alternator will kick in.
