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"and reasoned that if the ignition switch were hanging, or otherwise keeping the blue/yellow wire to terminal 50 energized, then I would find continuity between that wire and the positive battery cable: I did."
Did you also find voltage? Ie. If the blu/yel wire is staying energized, there would be 12V between it and ground.
In older 240s that experience wire sheath rot, stray voltage may occasionally find itself to the blu/yel wire and cause the starter to engage.
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1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.
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