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Re: Wiring Delco alternators


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Posted by jdemaris on October 04, 2010 at 06:43:56 from (67.142.130.22):

In Reply to: Wiring Delco alternators posted by J heikemper on October 03, 2010 at 18:17:44:

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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