OKAY!! FINE, skip the light and old school easy method and use a meter, but I think you both missed the point. After the current test (assuming the meter shows excessive flow) and let us not forget to wait a few minutes to allow computer to sleep, REMOVE the wires from the alternator and test AGAIN. Has excessive current stopped? Yes = repair or replace alternator.
No where did I say replace alternator if light is on, or current is flowing.