Re: One-Wire Alternator to 3-Wire

Posted by Jon Hagen on April 20, 2007 at 06:06:13 from (75.104.56.247):

In Reply to: One-Wire Alternator to 3-Wire posted by Gene-AL on April 19, 2007 at 19:57:27:

I build both one wire and three wire Delco alternators for what ever best fits the application.
The brand of one wire regulators I buy have instructions with them that they can be used with an alt warning light by connecting it to the #1 regulator terminal. Atleast with this brand, you do not need to add the #2 sense wire, although I have installed it and they work fine either way. The box of regulators came with instructions saying that there is no problem using these regulators in any application where a charge light or lower excite rpm is desired.
One trap not to fall into is buying more "one wire" alternator than you need, the smaller the amp output, the lower the excite rpm. A 37 amp "0ne wire" Delco will excite at about 1/2 the rpm of a 72 amp "one wire" unit.

By the way, there have always been FACTORY "one wire" Delco alternators. The "one wire" version of the Delco 27SI have been used in truck industrial and marine applications since the 70's.
The factory Delco"one wire" regulator parts fit right into the smaller 10SI-12SI alternators, although I rarely use them. They cost 8 times as much as an aftermarket "one wire" regulator. They have an externally adjustible voltage adjustment which I feel has little value for the average user.

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