"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. "

Amen. In 80-87 240's the red alternator exciter wire and the yellow-blue starter wire would touch after their insulation crumbled off. The red wire would then provide battery voltage equivalent from the alternator, once running, and keep the starter solenoid engaged as long as the engine kept turning.
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Art Benstein near Baltimore

Ever consider what our dogs must think of us? I mean, here we come back from a grocery store with the most amazing haul -- chicken, pork, half a cow. They must think we're the greatest hunters on earth! -Anne Tyler