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 City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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