Mike is correct...the large current load on these 3 phase hairpin stators in conditions where all the available current is delivered does tax the design of the factory alternators. The diode's are all created on a single silicon substrate to assure uniform junction characteristics. This method allows for the PIV (peak inverse voltage) to closely match across all six diodes in a "three phase" rectified bridge. The old school would be to use individual large stud mounted diodes however; they would