Re: One Wire Alternators.....

Posted by jdemaris on November 24, 2006 at 07:02:49 from (69.67.231.83):

In Reply to: One Wire Alternators..... posted by davpal on November 23, 2006 at 22:11:26:

You can take any Delco 10SI or 12SI, and with ten minutes work install a $12 self-exciting regulator. When I used to use the Delcos, I'd pick them up for $15 apiece and convert them for another $12. I stopped using Delcos, however, since the Hitachi alternators are better built and more compact. On many tractor conversions, a smaller more-compact alternator is sometimes needed. Also, the Hitachis are seal and have full ball-bearing support on both ends - the Delco 10SIs do not.
When Deere Co. started using Delco 10SIs in place of the more expensive sealed units, e.g. Motorolas, there were many early failures - most assoiciated with the Delco's lack of sealing against dust. Again, with part-time use tractors that's not much of an issue. And besides, you can buy buckets full of Delcos for $10 - $15 apiece at many junkyards.
Many of the Delcos will self-excite without altering - i.e. one-wire hookup - but it's not practical since they usually have to rev up to 3000 RPM to do it.
When you buy a pre-converted, over-the-counter one-wire Delco alternator, a 14.75 volt DC self-energizing regulator seems to be the most common choice. Depending on the pulley size used, a tractor often has to be revved up to over 1500 RPM to make it cut in. There are also many other variations of those self-exciting regulators - some cut in at a lower DC voltage, and some sense AC voltage instead.
One reason that one-wire hookups are not desired in automtove use - is they lack the ability to sense the small variation of voltage - when measured at the battery and compared to a separate reading at the alternator output. A one-wire hookup nullifies that ability - but for tractor use, it's not very important.

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