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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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