Home Forum Ask A Member 1953-54 25 horse evinrude

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  • #284928

    I posted in the wrong place

    I tested both coils and only get a reading between primary and secondary.  Then when i put the clip on the plug output, i get nothing. Could i have been sold 2 bad ones?

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    #284930
    crosbyman
    Participant

      Canada Member - 2 Years

      HV pins  to either primary is ok  if you get  4- 8kohms   (use a  scale above   0-10kohms  if  using  a analog VOM)

      if  primaries between themselves  =>     0-1 ohm    coils should be OK

      otherwise the plug wire is open,  baddly screwed in the HV screw pin  or   boot end spring is corroded .

       

      in any  event  if not done     you may as well insall new solid metallic  plug wires     no carbon  high resistance stuff !

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      #284931

      Shouldn’t  i get a reading from one of the leads to spark wire outlet? I have put on new wires as well

      #284933
      crosbyman
      Participant

        Canada Member - 2 Years

        HV  screw pins  to either primary is ok  if you get  4- 8kohms   if not coil is bad.

         

        see link

        Testing an Outboard Coil with a Multimeter using an ignition coil from the Johnson H or T (pochefamily.org)

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        #284935

        So it looks like i bought 2 bad coils?

        #284936
        crosbyman
        Participant

          Canada Member - 2 Years

          where did you buy them  amazon ??   local store ebay  ??

           

          does meter show  0 ohms  when probes are shorted   is it an analog meter or digital ??

           

           

          analog ones have scales  that must be set  right

           

           

           

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          #284937

          I believe i got them from Amazon, meter is digital <!–more–>

          #284956
          crosbyman
          Participant

            Canada Member - 2 Years

            if you meter works… if you can’t return for  a refund  and  if they both test bad…. and you are testing  them properly …..  well  saddly you need 2 new (good ones) . imho anyway.

            Joining AOMCI has priviledges 🙂

            #284957
            crosbyman
            Participant

              Canada Member - 2 Years

              if you meter works… if you can’t return for  a refund  and  if they both test bad…. and you are testing  them properly …..  well  saddly you need 2 new (good ones) . imho anyway.

              Joining AOMCI has priviledges 🙂

              #284968
              frankr
              Participant

                US Member

                Two bad (new) coils would be extremely rare.  I don’t think you are testing them correctly.  There are two wires coming out of the coil one above and one below the laminated core.  The one below the laminations is the primary winding and goes to the points.  The one above the laminations is ground for both primary and secondary windings and is grounded under one of the mounting screw heads.  The spark plug wire (pin where it plugs in) is the secondary winding.

                To test:

                Connect your meter leads to the primary winding by touching one meter lead to the points wire and other meter lead to the ground wire.  Should be about an Ohm.

                Connect your meter leads to the secondary winding by touching one meter lead to the spark plug wire (or pin) and the other meter lead to the ground wire.  Should be around 4 – 7 k-Ohms.  Actual resistance varies with different mfr.

                Very important:  Your tests are useless if you haven’t set up your meter for the resistance range you expect to get.

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