Is it normal for an alternator to go bad at just under 71,000 miles? Took it to an alternator shop to have it rebuilt. However, they were unable to find the needed parts to rebuild the Bosch alternator. Also the shop could not even find anyone that stocked a new alternator for it. Had to go to Auto Zone and buy a rebuilt one. They couldn't even get a new one for me because it was out of stock. Why would Buick put a Bosch alternator on their cars (German made)? I was also told these alternators do not last much over 70,000 miles. $200 every 70,000 miles? If this is true I would say it is a bad manufacturing idea or lemon. Any ideas on this?