'56 Ammeter gauge wiring contrary to Assembly Manual - NCRS Discussion Boards

'56 Ammeter gauge wiring contrary to Assembly Manual

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  • G B.
    Expired
    • December 1, 1974
    • 1407
    #1

    '56 Ammeter gauge wiring contrary to Assembly Manual

    I'm installing new Lectric Limited reproduction wiring harnesses in 1956 #3080. This car had homemade wiring, so I don't have unaltered original harnesses to guide me. I'm relying on AIM and ST-12 wiring diagrams to show me routing and connections.

    I now have all wiring hooked up under the dash and everything working. However, the ammeter was reading backwards when I connected the wiring as shown in the AIM. With the black wires on the gauge terminal closest to the clock, the gauge would show a charge (rather than a discharge) when I turned on the headlights. When I put the red wires on that terminal as shown in the photo below, the gauge showed a discharge with the lights on.

    MVC-004S.JPG

    The AIM and ST-12 (photos below) show the wiring connections opposite of the way my gauge needs to work right. I colored the AIM diagram wires as marked.

    MVC-001S.JPG

    MVC-003S.JPG

    My aftermarket wiring diagram (shown below) was no help at all.

    MVC-002S.JPG

    Are the AIM and ST-12 wiring diagrams wrong, or is my gauge flawed somehow internally?
    Tags: None
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    • Joseph L.
      Very Frequent User
      • July 26, 2012
      • 162
      #2
      Re: '56 Ammeter gauge wiring contrary to Assembly Manual

      Hi Jerry

      My 1957 is wired like your car is and has worked fine. It is not your gauge.

      Joe
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        • Dennis C.
          Very Frequent User
          • June 30, 2002
          • 884
          #3
          Re: '56 Ammeter gauge wiring contrary to Assembly Manual

          Rest easy, it is well known that the wiring diagram in the ST12 and the AIM has the ammeter wiring connections reversed. If you search the TDB, you will find many threads on it.
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            • G B.
              Expired
              • December 1, 1974
              • 1407
              #4
              Re: '56 Ammeter gauge wiring contrary to Assembly Manual

              Thank you both for your replies. I just did a search and found Board posts from 2010 and 2004 that discussed the ammeter wiring diagram error. I'm sorry for wasting everyone's time with my question.
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                • Dennis C.
                  Very Frequent User
                  • June 30, 2002
                  • 884
                  #5
                  Re: '56 Ammeter gauge wiring contrary to Assembly Manual

                  Originally posted by G A Bramlett (135)
                  Thank you both for your replies. I just did a search and found Board posts from 2010 and 2004 that discussed the ammeter wiring diagram error. I'm sorry for wasting everyone's time with my question.

                  It's never a waste of time to share knowledge, especially with someone like yourself, who has shared so much.
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