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Message: <blockquote data-quote="stormsearch" data-source="post: 6681661" data-attributes="member: 615664"><p>Stock alternators (well at least the ones I deal with) are rated at a certain temperature and speed (80 °F and 6000 alt rpm are common) and tested according to an SAE test method.  They can produce slightly higher current, but generally at higher temperatures they will produce lower current.  My pontiac vibe will have dimmed headlights if I turn on the back light defroster - poor design.  If ever added a sound system to that vehicle, will definitely need a bigger amp.  What alt do you have.  Even my truck, always wish for more power.</p></blockquote><p></p>

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