Ignition Problem

I have a 1974 115 Johnson on a 1976 Ventura 2 that runs great, in fact it runs so well that when I cut the key off it stays running. I was wondering if you can help me solve this problem? I have done a check on the key switch and it checks out okay, I have gone as far as buying a new wiring harness on the engine but have not replaced the one to the controller yet, I have checked the plug on both ends, of the controller and on the engine with an ohm meter and they give good readings, no shorts or corrosion problems. I would like to get a new controller to replace the wiring on that end but I am not sure if that would solve the problem, is there something that I am missing here? I know in order to kill the engine that the engine needs to be grounded to kill it. I also have gone as far as putting a separate ground wire from the key switch back to the engine and it worked a couple of times and then never again. To help solve this matter, and to make it easier to figure out, the wiring on the engine is all new including power pack, stator, voltage regulator. The only thing left is the controller wiring harness, but I donít believe that this will fix the problem. Also is there a newer style controller out there that will fit this older model engine that has the lanyard kill switch that will work with this engine?

Thanks for your time

Chris E. Nicholas



You could use a new control box on this engine with very minimal adaptations or changes.  It may solve about 90% of your problems.  Sounds like the main kill wire is not making a connection from the control box to the motor.  You either have a bad harness or a wire in the harness.  Make sure the key switch has continuity between the two M terminals when the key switch is in the off position.  This should short the CDI unit to ground and turn off the motor when the key switch is turned off.  If this doesn't happen, the motor won't turn off.    If you can, get a wire schematic for this engine as it
will help you follow the wire codes in the harness.  It is really a simple problem made complicated by the multitude of connectors and wires used in a harness of that type.

 Hope this helps a little bit.



Please submit whatever questions you have to IHRTechTalk@yahoo.com.  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Mark C.


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