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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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