batter light at high RPMs

Had that problem, was going down the street in 1st at about 4K like a jackass one night, boom, battery light.

from there on, the batt light came on anything above 2K and voltage would drop. Replaced the alt and haven't had problems since.

I would personally test the alt power feeds and such first before I would say it's bad.

the only explanation I can think of, being a Mustang owner, is that most people here don't cruise around normally. I like to drive mine for what it is, a Mustang. Hence it seems i'm probably a little harder on it than most would be.

Mine sees a lot of high-rpm use. Thinking about that, if the motor is spinning 4K, the alternator is over-driven. if you don't have under drive pullys you're spinning that alt around 15,000 or so, depending. That has to be hard on components, especially the alt's components probably aren't balanced that well to begin with.

My opinion, there probably isn't anything wrong with the people's car's that keep having problems, it's probably just a result of how they are used.