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 - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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