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 Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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