Originally Posted by T-bucket23
The main difference between a 1 wire and a 3 wire is the regulator. I have read that some of the 1 wire regulators will work exactly like a 3 wire if you connect all three wires and some wont. Depends on the manufacturer. Maybe this is why there is no clear cut information.
That is what I've seen as well. If you look at the two tabs for the connector that stick through the alternator housing, some one-wire units actually have these two tabs connected by a little metal bridge strap. Obviously, this won't work as a three wire unit. I have never seen an OEM one-wire unit, though some marine applications may be set up that way.