The only thing I find "good" about the 10SI and 12SI Delcos is they can be found cheap, if you are a good scrounger. I rarely pay more then $10 apiece. An aftermarket self-excite regulator cost another $12, so these "one-wire" units can be had for $25 or less.
Downside to automotive-spec. Delco 10SI and 12SI alternators is their large size/diameter, poor rear bearing support, and lack of dust protection for farm use. Any of the so-called "one wire" units I see for sale, advertised for tractor conversions are Delco spec "100", which means "standard light duty", i.e. not meant for tractor use. Fine for collector tractors that don't get used much. Use it on a full-time use farm tractor, and dust does them in pretty fast unless they get a dust-seal kit added.
For those stated reasons, I've been using little Hitachi alternators for years - mostly off of 80s-90s Subarus. Much more compact, all ball-bearing supported, AND sealed. A much better unit.
Delco does make some good small sealed alternators on later cars and trucks, but they aren't always cheap. The CS series has full ball bearing support, is more compact, and better sealed then the older 10SI and 12SI units.
Some Delco specs:
Farm rated Delcos - 10SI type 116 and no 12SIs
10SI comes as 100, 116 or 136 ,14 pole. 6.6 OD by 7 deep, metal fan
61 amps at 6000 RPM and 0 amps at 1600 RPM 72 amps at 6000 RPM and 23 amps at 1600 RPM
12SI comes as 100 only ,14 pole. 6.6 OD by 7 deep, plastic fan 66 amps at 6000 RPM and 30 amps at 1600 RPM 78 amps at 6000 RPM and 30 amps at 1600 RPM 94 amps at 6000 RPM and 30 amps at 1600 RPM
Delco types: 100 is light duty only and three-wire hookup (or two wire), 5/8 shaft 102 is medium to HD, totally enclosed, and in 1 or 3 wire), 5/8 shaft 110 is flame resistant and 1 wire hookup, 5/8 shaft 116 has special brush holders, 1 or 3 wire, and an tach terminal, 5/8 shaft 136 has special brush holders, 3 wire hookup, tach termial, and 7/8 shaft
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I dont think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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