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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.
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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.