Right Aaron, but there's more. The oil pressure switch. "excites" the alternator on those Masseys. The external regulated alternator found on the 100 series is totally different than a "3 wire" alternator. While you'll find a FIELD terminal and a SENSE terminal on the alternator, they don't use both. The pressure switch gets 12V from the regulator and once it senses oil pressure (your "run indicator") the switch sends power to the "F" (field) terminal of the alternator. That excites te alternator. This wiring scheme causes the alternator to charge as soon as the engine is running instead of having a cut in point determined by RPMs like a 3-wire alternator. There is no "sense wire" used.
Also, the pressure switch sends 12V to the fuel gauge so that the fuel guage is powered only when the engine is running.
Years ago I spent a week chasing a NO CHARGE on a 135 Massey thinking I had a bad regulator or alternator or wiring, only to find a bad PRESSURE SWITCH. Last thing in the world I suspected was something to do with the oil pressure gauge.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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