’68 Johnson 100 hp distributor cap resistor wire replacement

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  • November 10, 2016 at 11:56 pm #5668
    boatman
    Participant

      Hi guys,

      I have a ’68 100 hp V4 Johnson that needed the resistor replaced since it had rubbed through the outer cover and was leaking oil. I have a donor motor that I’ve pulled the resistor off of to make the swap. The resistor wires going to the distributor cap are different lengths, so I’ll need to swap them as well. I got the wires off of the resistors fine. How do I remove them from the distributorcap? I don’t want to mess anything up by yanking on them. Do they pull straight out? Unscrew?

      While I have the cap off, anything I should check or do maintenance on? The contacts all look good, no corrosion. Also, can I buy this type of resistor at the auto parts store or is it a marine only type part. I really appreciate the help.

      Thanks,
      Paul

      November 11, 2016 at 12:34 am #47255
      rmhxruss
      Participant

        When looking at the parts catalog. They look to unscrew.

        November 11, 2016 at 1:42 am #47257
        frankr
        Participant

          Say what?? What resistor? There is no resistor. Do your mean the coil? Are you speaking of the spark plug wires? If that is what you mean, yes they unscrew from the distributor cap.

          November 11, 2016 at 2:32 am #47262
          fleetwin
          Participant

            US Member
            quote FrankR:

            Say what?? What resistor? There is no resistor. Do your mean the coil? Are you speaking of the spark plug wires? If that is what you mean, yes they unscrew from the distributor cap.

            Glad Frank was man enough to admit it, I’m confused too…

            November 11, 2016 at 2:38 am #47263
            boatman
            Participant

              Thanks guys! Yes, it is the coil. Says 12 volt resistor on the outside of it. Sorry for the confusion. I’m more familiar with working on the <40 hp OMC engines, so not up on the lingo on these bigger V4 engines.

              Appreciate it!

              November 11, 2016 at 2:39 am #47264
              boatman
              Participant

                Can I find this type of coil at the auto parts store, or what is the best source for one as a backup?

                November 11, 2016 at 4:32 am #47276
                dan-in-tn
                Participant

                  US MEMBER PAY BY CHECK

                  Well they actually called it a Pulse transformer assembly! It has now been replaced by a coil kit #433659. ME (MarineEngine.com) has them on sale for $24. Hard to beat that when they were near $100! Comes with bracket, wire, and all the stuff you need. Pretty good deal I think.

                  Dan in TN

                  November 11, 2016 at 5:34 am #47278
                  boatman
                  Participant

                    Thanks, Dan!

                    November 11, 2016 at 12:20 pm #47284
                    frankr
                    Participant

                      That’s a good point. It has such a funky name because it is somewhat special. It operates on input pulses on the order of 300 Volts. Not like a "normal" coil that runs on 6 or 12 Volts.

                      BTW, you don’t want to go experimenting on that system. The pulse pack is easy to destroy and costs $$$

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