One thing that can foul up your day when picking junkyard Delco alternators is a goofy crossbred unit built by Delco in the mid 70's Production of the 10DN alternators had stopped, but for some reason GM still put the external regulators on small cars like the Nova. The alternators on those cars used the same design as the internal regulator SI series, but did not have an internal regulator or diode trio. They had a goofy brush holder and stator connection that accepted the old square,parallel terminal regulator plug. The Rear alt case had an odd shaped plug hole (kind of like a Chevy bowtie emblem) that would accept either the old square 10DN plug or the long SI plug.
These qdd ball alternators could be converted to an internal SI type by just removing the original setup and replacing it with a stock SI type brush holder, diode trio and internal regulator.
Always pays to look at the regulator plug hole when picking a junkyard Delco SI off the pile.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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