Alternator for my drag car

I have the Powermaster #75191 1-wire alternator on the avatar car. 2 electric fans switched separately for the radiator and a separate trans cooler fan switched by itself. With the battery in the trunk, all 3 fans running, fuel pump obviously running, headlights on, foot on brake, etc, I think I've seen as low as 12.5v on my voltmeter gauge. The alternator came with a test record for it...it showed 82 amps at idle...just don't recall what "idle" means. I'm sure a call to their tech line would answer this quickly as I know I spoke with them a couple years ago and they were quite helpful.