The one that's used most often is the General Motors 10-SI series. It has an internal voltage regulator and was standard equipment om practically all GM vehicles from the late 1970's to the early 1990's. The smaller-housing alternators from the 90's forward aren't quite as reliable, IMHO. The 10-SI has amperage capacities from 65 amps to 90+, depending on the year and application.

Unless you're running some mega-blaster sound system or a set of hydraulic pumps for a bouncy lowrider, any of them should provide plenty of current to keep the accessories running and the battery charged.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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