If you have seen a 10SI looking Delco (terminals out the side rather than the back) with the markings R and F you have run across a rare alternator. As far as I know there was only one alternator like that. I don't remember the application but it was just before the internal regulator alternator was used. Alternators with R and F markings are used with external regulators. The (R)elay terminal is used to close the field relay in the external regulator. Something to keep in mind, the output on this terminal is AC voltage, not DC voltage. The(F)ield terminal is connected to one of the brushes in the alternator. The other brush is grounded. The F terminal receives power from the regulator to control the alternator output.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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