"Once turning, the alternator generates an electrical current. No matter the electrical load you place on the alternator the engine will NOT work harder. If the electrical load becomes to much for the alternator things will simply stop working. but the cost to run that specific alternator will not change (barring wear and tear on the bearings and sh-t like that)"
Now that is one ignint statement.
Thats what I thought before I thunk it out. :)