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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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