SIII Alternator 4 wire hook up? Help!

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  • chicken
    Low Range
    • Feb 2012
    • 19

    SIII Alternator 4 wire hook up? Help!

    I'm lost, dazed and confused. I had a Lucas 18ACR alternator and it has run out of smoke. I purchased a new unit from Rovers North. Problem is that the old unit had a 3 wire connector and 1 extra 16ga wire (brown) on a separate spade lug. The new unit has only a 3 wire plug. Is the 4th wire a load sense? And how do I hook all this up and have it work? This is for a 1975 S3 diesel 109, came from Norway...somehow. Can anyone shed light?
    1975 SIII 109, 200 TDI, P-38 power steering, ex-Norwegian Army
  • LaneRover
    Overdrive
    • Oct 2006
    • 1743

    #2
    Originally posted by chicken
    I'm lost, dazed and confused. I had a Lucas 18ACR alternator and it has run out of smoke. I purchased a new unit from Rovers North. Problem is that the old unit had a 3 wire connector and 1 extra 16ga wire (brown) on a separate spade lug. The new unit has only a 3 wire plug. Is the 4th wire a load sense? And how do I hook all this up and have it work? This is for a 1975 S3 diesel 109, came from Norway...somehow. Can anyone shed light?
    Wish I knew more and could help. Have you contacted Rovers North to see what they say? Maybe others have had the same issue.
    1958 107 SW - Sold to a better home
    1965 109 SW - nearly running well
    1966 88 SW - running but needing attention
    1969 109 P-UP

    http://www.facebook.com/album.php?ai...2&l=64cfe23aa2

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    • chicken
      Low Range
      • Feb 2012
      • 19

      #3
      Thanks for the reply. As yet no one has answered the question yet. Hoping for an answer soon. I'll have to go to plan B and get a Delco if I don't hear soon.
      1975 SIII 109, 200 TDI, P-38 power steering, ex-Norwegian Army

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      • bkreutz
        4th Gear
        • Apr 2010
        • 408

        #4
        Changing wire configuration on replacement electrical parts is not uncommon in the industry. Normally such changed parts come with instructions how to convert (or adapt) to the original configuration. You said no one answered, but have you contacted the seller (as was suggested earlier)? I would pursue that route first rather than relying on random ideas on a forum (not aimed at anyone but a lot of unintentual misinformation gets disseminated).
        Gale Breitkreutz
        '03 Disco
        '74 Series III 88 (sold, 4/13)
        '47 CJ2A

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        • siiirhd88
          3rd Gear
          • Oct 2006
          • 369

          #5
          This web page for vintage Triumphs discusses differences between Lucas three and four wire alternators:



          Maybe it will help.

          Bob

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          • chicken
            Low Range
            • Feb 2012
            • 19

            #6
            Rovers North has not answered yet, maybe stumped?
            1975 SIII 109, 200 TDI, P-38 power steering, ex-Norwegian Army

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            • chicken
              Low Range
              • Feb 2012
              • 19

              #7
              Reading the VTR page, the authors suggests that it will work without the load sense (4th wire), but I think I would like RN to give the okay. Its all about plausible deniability, right?
              1975 SIII 109, 200 TDI, P-38 power steering, ex-Norwegian Army

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