Roundback vs. Squareback alternators?

SixgunSal said

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.

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I don't know what else to tell you. All you do is ground one of the field tabs. It doesn't matter which. Then attach the field wire on the car to the other that's not grounded. Done. If you didn't put the brush back in, there's no way it'll ever charge. Was the old one charging? If not, you sure it was the alternator?