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I assume your talking about the rectangular plug right at the alternator, and that your new Alt came with a short repair harness, the 2 heavy wires are BAT and the slim and likely white one is Tachometer AC sense, likely that 3 of the old ones were Bat test the old connector with a test light to see which of them have power to them.

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โˆ™ 2007-12-08 05:22:32
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Q: What do you do with the extra alternator wire on the 1986 Ford Escort plug there are four wires and new alternator plug has three?
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