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  • WIRING DIAGRAMS, Electrical system

    Here is the same info presented in 3 different ways:

    1 wire.jpg


    Notice:::::: The two wiring diagrams below are pre NOV 29. All cars should be wired as shown above in the first diagram
    SEE POST #5 BELOW!!!

    3 wire.jpg

    2 wire.jpg
    Last edited by tbirdtbird; 06-28-2017, 09:44 AM.

  • #2
    I'll need this soon for the lights....

    Comment


    • #3
      Scan0015.jpg
      3 ~ Tudor's
      Henry Ford said
      "It's all nuts and bolts"


      Mitch's Auto Service ctr

      Comment


      • JohnnyDeMichael
        JohnnyDeMichael commented
        Editing a comment
        Nice diagram of switch, but is the diagram showing the connection side of the switch or the side with the 9 bumps. I’m new the forum. My wiring is original but good. On the black disc that goes in the light switch housing, there is no connection for the horn in the middle. If it once had a connector, I don’t see where it would have been attached. In middle is just a circular cylinder that’s is split I’d the middle. Should I try to solder a connector to the side of it? Surely another way . . . ?.?

      • Mitch
        Mitch commented
        Editing a comment
        You might want to start a new thread in the main Model A discussion forum
        this may help?
        https://www.vintagefordforum.com/for...ch-spider-info

    • #4
      Scan0016.jpg
      3 ~ Tudor's
      Henry Ford said
      "It's all nuts and bolts"


      Mitch's Auto Service ctr

      Comment


      • #5
        Originally posted by tbirdtbird View Post
        Here is the same info presented in 3 different ways:

        1 wire.jpg3 wire.jpg

        2 wire.jpg
        Has anyone else seen that the terminal box wiring on the first two diagrams is different? Take a close look.

        On the first, the feed to the ignition is on the side where the generator connects, whereas on the second, the ignition circuit is on the other side where the battery connects.

        Bill
        Last edited by BillLee/Chandler, TX; 01-17-2019, 07:25 AM.

        Comment


        • #6
          Originally posted by BillLee/Chandler, TX View Post

          Has anyone else seen that the terminal box wiring on the first two diagrams is different? Take a close look.

          On the first, the feed to the ignition is on the side where the generator connects, whereas on the second, the ignition circuit is on the other side where the battery connects.

          Bill
          This change in wiring took place I believe in 1929. Vehicles wired the old way were usually switched over. This is documented in the service bulletins see attached

          86DD4907-DE42-4608-ACCF-6D35F38829C2.jpeg


          3 ~ Tudor's
          Henry Ford said
          "It's all nuts and bolts"


          Mitch's Auto Service ctr

          Comment


          • BillLee/Chandler, TX
            BillLee/Chandler, TX commented
            Editing a comment
            Looks like the correct/current diagram is the second one. Or is it the first?

            (Confusion abounds here! )
            Last edited by BillLee/Chandler, TX; 01-17-2019, 08:29 AM.

          • Mitch
            Mitch commented
            Editing a comment
            The first is
            The black wire from the coil will should go to the drivers side of the junction box. The drivers side of the junction box will then feed the passenger side of the ammeter.
            Of course this is on a left hand drive vehicle

        • #7
          "Excluding the starter, on a correctly wired Model A, the only current passing through the ammeter is the current into or out of the battery."

          Is the above statement correct?

          Comment


          • Mitch
            Mitch commented
            Editing a comment
            The above statement is correct. Vehicles pre wiring change the ignition was not passing through ammeter. If the points were closed and the key was turned on the draw would not register

          • BillLee/Chandler, TX
            BillLee/Chandler, TX commented
            Editing a comment
            Thanks, Mitch.

        • #8
          E948E289-12FA-4610-BDAB-A3D29C783CEE.jpeg
          3 ~ Tudor's
          Henry Ford said
          "It's all nuts and bolts"


          Mitch's Auto Service ctr

          Comment


          • #9
            How come no dome light? What is their color and where does the power hook up?

            Comment


            • #10
              Can't give you the wire color but it comes directly off the Junction Box. Black w/Red tracer comes to mind.
              You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!

              Comment


              • #11
                Just purchased a 1930 Model A.

                Found this diagram with documents the previous owner had.
                You do not have permission to view this gallery.
                This gallery has 1 photos.
                Last edited by Getgoof; 01-21-2020, 11:20 PM.

                Comment


                • #12
                  Originally posted by Getgoof View Post
                  Just purchased a 1930 Model A.

                  Found this diagram with documents the previous owner had.
                  Welcome Getgoof to the VFF!! Thanks for posting that wiring diagram to our tech thread. It is a little different from the others so thanks for sharing it. Feel free to do an intro and post pics of your new A in the main Model A discussion area.
                  3 ~ Tudor's
                  Henry Ford said
                  "It's all nuts and bolts"


                  Mitch's Auto Service ctr

                  Comment


                  • #13
                    Scan0272.jpgScan0275.jpgScan0276.jpg
                    3 ~ Tudor's
                    Henry Ford said
                    "It's all nuts and bolts"


                    Mitch's Auto Service ctr

                    Comment


                    • #14
                      D25F5189-5ABC-4703-9D00-10CEF3672723.jpeg
                      3 ~ Tudor's
                      Henry Ford said
                      "It's all nuts and bolts"


                      Mitch's Auto Service ctr

                      Comment


                      • #15
                        Question: On ALL the diagrams above, is it IMPLIED that the coil case should be grounded in order to work properly? I just had to replace a coil on my 6V 8N tractor to get it running. I ran across an old posting on a tractor website where a statement was made that the case of the coil needed to be grounded to function properly. I serviced the electrical system on the 8N in September, but went out last week (February 1) and it simply would not work until I replaced the coil. I am trying to understand if it lost its ground. Thanks.
                        PS, I don't think a coil case would need to be grounded.
                        Last edited by Bud_D; 02-08-2021, 07:19 PM.

                        Comment


                        • #16
                          Originally posted by Bud_D View Post
                          Question: On ALL the diagrams above, is it IMPLIED that the coil case should be grounded in order to work properly? I just had to replace a coil on my 6V 8N tractor to get it running. I ran across an old posting on a tractor website where a statement was made that the case of the coil needed to be grounded to function properly. I serviced the electrical system on the 8N in September, but went out last week (February 1) and it simply would not work until I replaced the coil. I am trying to understand if it lost its ground. Thanks.
                          PS, I don't think a coil case would need to be grounded.
                          Hi Bud
                          The coil casing does not need to be grounded
                          3 ~ Tudor's
                          Henry Ford said
                          "It's all nuts and bolts"


                          Mitch's Auto Service ctr

                          Comment

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