Hey Bus Driver - several things to know about the SI series Delco alternators:
1 - Alternators rated 63 amps and below are the 10SI family. Ratings 70 amps and higher are 12SI. (Amp rating is stamped on the front half near the tensioning ear next to the part number .) The 12SI is somewhat larger than the 10SI. But they are otherwise completely interchangeable.
2 - The SI alternator rear half - hence the aux connector and output post - can be easily clocked (repositioned) relative to the pivot ear in 90 deg increments. Simply remove the 4 through screws that hold the halves together then carefully rotate the rear half as desired and replace the screws.
3 - Don't worry about water getting into the alternator. The SI series are pretty tough - a small amount of rainwater getting into the alternator won't hurt a thing!
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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