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Message: <blockquote data-quote="helotaxi" data-source="post: 1813946" data-attributes="member: 550915">Unibody: the car has no frame.  It is all formed sheetmetal that is tack welded and glued together.  Most are really terrible conductors and don't make for a good chassis ground.To answer the OP question, once you exceed the max output of the alt, the battery starts to discharge and the whole time, the alt is running at its max capacity which it was not designed to do.  It will eventually get very hot and like most all things electrical heat is its enemy.  Eventually the excessive heat will cause the alt to fail.  Discharging a normal battery more than would normally occur during the starting of the car will eventually damage it as well.</blockquote>

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