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Old 08-13-2012, 10:21 AM
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GM alternator Info source

Product Search | Delco Remy | Remy

Use the link ( and select e-catalog) and you can select the year, car and engine and see what starter or alternator they make for that year now. These choice probably mirror what was available back then and you can try and find a junker from that model, etc.
I was using the application search tab to get an idea of what cars offerred the 12si and what amp model was used for what. Then when you pull up a vehicle select say the 78 amp model 12si. When that page loads there is a list at the bottom by make and you can see other models from GM that used that same alternator.
It was helpful for me and maybe it can help someone else find the 78 or 94 amp 12si for example and what cars to track down.

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Old 08-17-2012, 12:09 PM
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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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