ok, when the afc is connected, the mas is connected and all making it idle lower, but when i disconect the afc it disconnects the mas which makes it idle higher, putting out enough where i can run the car without a battery. i cant read volts when i disconnect the afc, so i was just thinkin because it would run with the afc disconnected, but i wasnt think of how it idles higher. i think its the alt, but when discount tests it, they say its fine