Your battery must have been bad due to age or [img]/phpBB/images/smiles/icon_confused.gif[/img].

My alternator only puts out 75 amps at max output, and it does a fine job keeping up. I do charge my battery about every 5 or 6 passes, but I also have a bunch of electrical items to run; big electric fuel pump (Holley 350), 2 electric fans (one 14" on the radiator and a 10" on the trans cooler), one electric fan in the car to blow air on the driver, MSD 7AL2 box, electric water pump drive, delay box, lights, tach etc.