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Alternator conversions

B

Bus Driver

Well-known Member
I have done several conversions with good results. Aligning the pulleys is very important to me and that often requires lots of work to accomplish. With Delco alternators I often need to place the two-prong connector for the exciter and sensing conductors at the top of the alternator. Toward the engine might require the alternator to be further out from the engine, outside or bottom for the connector places it in the path of tree limbs and weeds. How much danger from rain is the alternator with the connector at the top? Also, all these Delco alternators are not the same size. The one for Chevettes is farther between the bottom mount bolt and the tension bar bolt than is the one for a 1977 Chev pickup, for example. A 70 amp Delco from a 1983 Buick Regal is quite a bit larger also, but looks the same with same electrical hookup. Are the larger ones still considered to be 10SI?
 
All from what I understand are 10SI but not all of them are the same amp rating so the lager the alternator the higher the amp rating of the unit. As for the plug being up not big deal as for rain since they are made to take some of that type of thing being under the hood of a car/truck. Just look under the hood after you have hit a big mud puddle and most of the time the engine is wet all over
 
The ones for the chevette are still 10si's only with the extended ear on the endplate. If you put one on with the flat faced fan that is a 12si.they go up to 94 amps but as low as 42, if I remember right. They also made 15 and 17 si alternators that look like the 10 si's but are bigger diameter, and some them are pretty high amperage. The 15 and 17si alternators look diffrent if you look at the back of the alternator. hth jstpa
 
I've seen conversion alternators with a rubber plug installed over the unused spade terminals, seems you could run a bead of silicone around plug and reinstall and be pretty safe.
 
Thanks for the replies. On the shelf I have several alternators gathered mostly from wrecking yards. One local yard lets me look over their shelves and select any that I want. The 10SI does not show up there often anymore. And the bottom base mount is 1 3/4" long on the 10DN and is 2" on the 10SI- as far as I know. So swapping one for the other might require modifying the base mount.
 
I have a tube of sticky brown grease made for marine or wet exposed electrical fixtures.
A bit of it in the plug really helps keep those regulator terminals from corroding.
Many stock tractor 10SI installs have the regulator plug on top.
For whatever reason, those regulator terminals are unplated steel, and they rust in a weather exposed use like a tractor.

No clue why the couldn't, don't plate those terminals ?
 
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!
 
Thanks, Bob. Currently working on an early 140 Farmall and converting to alternator. Apparently the factory alternator mount used on the later 140 production is no longer available. Given the generous space available on the 140, the larger alternator will be used on it, saving the smaller ones for tighter spaces.
 
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