Remy 13239 Premium Remanufactured Alternator The regulator, rectifier and diodes are 100 percentage computer controlled and tested Brush and brush contact surfaces are 100 per cent machine polished Bearings are 100 per cent high speed alternator grade Copper windings are electrically tested for shorts, grounds and output capability Final alternator test is 100 per cent computer controlled tested and mechanically gauged/inspected