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delco alternator

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KermitDRambler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KermitDRambler Quote  Post ReplyReply Direct Link To This Post Posted: Apr/05/2012 at 11:36am
The 10si was used from the early 70's (72 or 73 I think) through the 80's. Take your pick of any GM car or truck from that time period and you'll be all set.

Edited by KermitDRambler - Apr/05/2012 at 11:39am
1967 American wagon
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billd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Apr/05/2012 at 2:50pm
Gee, Dennis - that info looks familiar!

 Some info I shared a while back ->

The 10si was the first internal regulator alternator - from GM for sure, but I believe from anyone.
It was used from the early 70s to the mid 80s and can be found all over. Physically larger than the Motorola units.
Then the 12si came out in the mid 80s to end up replacing the 10si. A few design changes and improvements. They included larger stator and rotor, heavier/larger diodes, this way GM could get more output from them.
Then the CS series replaced that for the late 80s and into the 90s.

The CS alternators are what GM came out with to replace their aging SI line. They put out a bit more amperage with a lighter weight.
The number after the CS is the diameter of the unit across the stator - that's the core that has the ring of windings in it, so that's very nearly the outside diameter of the alternator.
So a CS121 is about 121 mm across the outside of the stator. The CS130 is 130 mm across the stator.
The design was also a bit different in that they didn't use a diode trio for the first time with this CS series.

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