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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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