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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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