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Old 08-17-2012, 12:09 PM
red82c10 red82c10 is offline
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gm alternators

Just came from a local starter/alternator shop here in Greensboro and they told me a trick for quickly telling the difference between the 12SI 78 and 94 amp models. When you look at the back at the rectifier through the cooling square openings the 78 has a rectifier with straight fins and the 94 has curved fins. These guys also had *all* the internal parts available which is great find. Anyway, I hope this is helpful to someone in their junk yard endeavors.
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