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Old 03-23-2020, 09:41 PM   #4
Mike C
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Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,709
Re: 12 volt alternators

Functionally they are similar as well as size wise. But the GM appears to have better electronics and is the choice for people swapping into almost anything on the planet. The 10si/12si are easy to install and reliable in addition to being inexpensive.
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