There is nothing "good" about a 10SI except it is old design, common, and cheap. Many alternator including from GM that are better design. But they work fine on tractors.
Although also kind of obsolete. a 12SI is better design, same foot print, and same wiring as a 10SI.
If a Delco and the two-prong plug goes into the top, it is a DN and needs an external regulator. If a Delco that looks similar but the two-prong plug goes in the back - it has an internal regulator and is likely a 10SI (metal fan), or 12I or 17SI (plastic fans).
One-wire regulator cost me exactly the same as a three-wire regulator. Both charge fine at low idle speeds (1600 alterato shaft RPM). One-wire tends to kick in at higher RPMs though when you first start the tractor. One it kicks in for the first time, it works just like a three-wire except it does not sense actual battery voltage like a three-wire.
I have been using Hitachis or Delco CS series alternators on most of my old stuff.
With the three-wire setup - you need to have an "excite" wire that energizes the alternator to make it start to charge. Usually done by wiring it to the ignition switch. It needs to be isolated from the ignition system though or the alternator will backfeed and not let you turn off the engine. Using a 5 amp diode is one easy way. If you have an automotive type IGN switch - just wire the alternator to the ACC terminal and put nothing else there. Then it will isolate the alternator when the key is off.
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