First don't pull the positive cable off like that again. The best way IMHO would be to pull the alt. off an have it rebuilt. It is possibly only going the be the regulator. Your correct in that many, have went for replacements only to find they ordered the wrong replacement, or right replacement an wrong pulley. Pull the alternator, check what brand , compare prices, also check what it would be, to have rebuilt by a reputable service tech. Preparation is 90% of the battle. Good luck...