If a 1650 is like my 1950's, it has an ammeter instead of a charge light, so a "one wire" alt will work fine. I find that the smaller the stator winding in a SI series alt, the lower rpm at which it will self excite. A 37 amp one wire Delco will self excite at less than 1/2 the rpm needed for a 61 or 72 amp one wire model.
I don't know where guys are getting those screwy Delco SI series "1 wire" alternators that draw down the battery ? The aftermarket "1 wire" or self exciting regulators I have used for 20+ years sell for the same price as a stock "3 wire" regulator and have no connection to the battery, so it is impossible for them to draw down the battery.
If the tractor uses a "charge light", then the 3 wire alternator is the best choice, as connecting the charge light to the #1 regulator lead gives both low rpm charging and a functioning charge light.
One interesting fact, a "1 wire" alternator will function perfectly as a 3 wire type, so nothing is lost if you try a "1 wire" alternator, then decide you want lower excite speed or want / need a charge indicator light.
This is directly from an information sheet that was packaged with my last dozen box of "1 wire" self exciting Delco regulators. I have done that, wired a 1 wire alt as a 3 wire and find it works perfectly as a 3 wire unit.
The 1 wire alt used as a 3 wire, does not need the #2 sense wire connected, but you might as well install it, it will not bother the 1 wire regulator and is in place if you ever want to replace it with a stock 3 wire regulator.
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