Three quarters of the time the problem is not the kill switch itself but the devise on the lanyard (whatever that is called) that is removable in a man overboard situation.
With age it tends to warp just enough to cause the switch to activate.
And yes I think you are on the right track, ignition switch or kill switch problem.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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