All the above, plus, make sure the #2 "sense" wire in the alternator plug is connected to full battery voltage. If there is no connection or a poor connection between the #2 sense wire and battery voltage the alternator may charge flat out,18+ volts. BOB from ND tells me the original delco SI regular would default to about 1 volt above normal if the #2 sense wire sees no or low voltage, but I have seen aftermarket regulators that will charge "flat out" of they lose the #2 sense connection.
On A tractor where the alternator is exposed to weather, remove the regulator plug and inspect the flat regulator blades for rust. For some reason, most / all regulator blades are unplated steel and will get rusty. Clean those blades shiny and push a bit of electrical grease in the plug terminals to prevent more rusting.
I have had several SI series Delco's on tractors that charged flat out" because the #2"sense" blade became rusty and lost connection to the plug.
Also do not trust the volt reading from a digital meter, as an electrically noisy system will confuse a DVM and make it read high. A battery load tester has a big analog meter that when connected to the battery posts, will give an accurate charging voltage reading.
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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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