Roundback vs. Squareback alternators?

I tried that and it still isn't charging. That's the way its in the car now, and checking the battery as it's running its going down still. I couldn't get it above 12.12 at the battery at 3krpm, took it to OReillys auto and it failed the test.
Hopefully that’s your problem, I took mine back twice to get tested and checked out good, but today I started it and one of the alt case bolts backed out(it’s stripped!), so, back to oreillys.