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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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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