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  • Polarity of coil/distributor

    I have never known how to do this check and just found a refrence. Quote from a Chiltons Manual: " Check coil polarity, Connect a voltmeter negative lead to the coil's high tension lead, and the positive lead to ground. ( NOTE: reverse the hook up for a positive ground car ). Crank engine Momentarily. If volt meter reads up scale, the polarity is correct. If the volt meter reads down sacle, reverse the leads. ( switch the primary leads).

  • #2
    If you use the ignition switch to crank the engine and the primary leads are connected to the coil, I would think you'd be putting 25-30,000 volts through the 12V meter blowing it up! I think it would be easier to just look at the + and - marks on the coil and call it good, if you want to know it's polarity!

    StudeRich
    Studebakers Northwest
    Ferndale, WA
    StudeRich
    Second Generation Stude Driver,
    Proud '54 Starliner Owner

    Comment


    • #3
      If you use the ignition switch to crank the engine and the primary leads are connected to the coil, I would think you'd be putting 25-30,000 volts through the 12V meter blowing it up! I think it would be easier to just look at the + and - marks on the coil and call it good, if you want to know it's polarity!

      StudeRich
      Studebakers Northwest
      Ferndale, WA
      StudeRich
      Second Generation Stude Driver,
      Proud '54 Starliner Owner

      Comment


      • #4
        You can check it using a pencil as well, if you hold the tip of a lead pencil between a spark plug wire and the terminal that it would normally connect to and then crank the engine you should see the spark "flare" on the spark plug side of the pencil. If it goes toward the wire, coil polarity is reversed.

        HTH

        nate

        --
        55 Commander Starlight
        http://members.cox.net/njnagel
        --
        55 Commander Starlight
        http://members.cox.net/njnagel

        Comment


        • #5
          You can check it using a pencil as well, if you hold the tip of a lead pencil between a spark plug wire and the terminal that it would normally connect to and then crank the engine you should see the spark "flare" on the spark plug side of the pencil. If it goes toward the wire, coil polarity is reversed.

          HTH

          nate

          --
          55 Commander Starlight
          http://members.cox.net/njnagel
          --
          55 Commander Starlight
          http://members.cox.net/njnagel

          Comment


          • #6
            Man-o-man...
            That's way better than my method.
            Grab the wire.
            If it shocks the crap out of you, it's wired right.
            If not, reverse the wires and test again.[B)]
            Jeff[8D]


            quote:Originally posted by N8N

            You can check it using a pencil as well, if you hold the tip of a lead pencil between a spark plug wire and the terminal that it would normally connect to and then crank the engine you should see the spark "flare" on the spark plug side of the pencil. If it goes toward the wire, coil polarity is reversed.
            nate
            HTIH (Hope The Info Helps)

            Jeff


            Get your facts first, and then you can distort them as much as you please. Mark Twain



            Note: SDC# 070190 (and earlier...)

            Comment


            • #7
              Man-o-man...
              That's way better than my method.
              Grab the wire.
              If it shocks the crap out of you, it's wired right.
              If not, reverse the wires and test again.[B)]
              Jeff[8D]


              quote:Originally posted by N8N

              You can check it using a pencil as well, if you hold the tip of a lead pencil between a spark plug wire and the terminal that it would normally connect to and then crank the engine you should see the spark "flare" on the spark plug side of the pencil. If it goes toward the wire, coil polarity is reversed.
              nate
              HTIH (Hope The Info Helps)

              Jeff


              Get your facts first, and then you can distort them as much as you please. Mark Twain



              Note: SDC# 070190 (and earlier...)

              Comment


              • #8
                Sometimes the two methods end up being the same thing

                nate

                (OW! wait till I tell you to hit the key!)

                --
                55 Commander Starlight
                http://members.cox.net/njnagel
                --
                55 Commander Starlight
                http://members.cox.net/njnagel

                Comment


                • #9
                  Sometimes the two methods end up being the same thing

                  nate

                  (OW! wait till I tell you to hit the key!)

                  --
                  55 Commander Starlight
                  http://members.cox.net/njnagel
                  --
                  55 Commander Starlight
                  http://members.cox.net/njnagel

                  Comment


                  • #10
                    I have tried to make a change in my quote from Chiltons Manual. The quote is as written in the manual BUT , do not crank the engine,, Do Not crank the engine. Better yet forget the entire Quote, I think Chilton make a mistake .. I did loose a volt meter.

                    Comment


                    • #11
                      I have tried to make a change in my quote from Chiltons Manual. The quote is as written in the manual BUT , do not crank the engine,, Do Not crank the engine. Better yet forget the entire Quote, I think Chilton make a mistake .. I did loose a volt meter.

                      Comment


                      • #12
                        quote:Originally posted by curt

                        I have never known how to do this check and just found a refrence. Quote from a Chiltons Manual: " Check coil polarity, Connect a voltmeter negative lead to the coil's high tension lead, and the positive lead to ground. ( NOTE: reverse the hook up for a positive ground car ). Crank engine Momentarily. If volt meter reads up scale, the polarity is correct. If the volt meter reads down sacle, reverse the leads. ( switch the primary leads).

                        Comment


                        • #13
                          quote:Originally posted by curt

                          I have never known how to do this check and just found a refrence. Quote from a Chiltons Manual: " Check coil polarity, Connect a voltmeter negative lead to the coil's high tension lead, and the positive lead to ground. ( NOTE: reverse the hook up for a positive ground car ). Crank engine Momentarily. If volt meter reads up scale, the polarity is correct. If the volt meter reads down sacle, reverse the leads. ( switch the primary leads).

                          Comment


                          • #14
                            I would certainly not use a regular voltmeter that way! It COULD be done if you have a high voltage probe attachment for it. Not something most people have except TV repairmen or ignition system designers though. Without the probe (basically a voltage reducer) that several thousand volts will fry the meter.

                            Jeff in ND

                            '53 Champion Hardtop

                            Jeff in ND

                            Comment


                            • #15
                              I would certainly not use a regular voltmeter that way! It COULD be done if you have a high voltage probe attachment for it. Not something most people have except TV repairmen or ignition system designers though. Without the probe (basically a voltage reducer) that several thousand volts will fry the meter.

                              Jeff in ND

                              '53 Champion Hardtop

                              Jeff in ND

                              Comment

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