Drove it to work today and all is largely well, except the not-turning-off problem persists. Unplugged the now-prominent pink wire, and plugged it back in to start it up and go home. When I got home, I jiggled some things with no pleasing results until I happened to turn on the headlights while the car ran on its mysteriously-powered coil, and the engine died. I found that it won't quit if the lights are off, but if the lights are turned on, it acts normally. I could almost understand it if it's the other way around, but turning the lights on to kill the engine is pretty bizarre. I only have a barely-half-baked theory that there is a voltage leak through the ignition switch that is enough to keep the relay energized, and turning on the light draws it down enough to de-energize the relay. The weather precludes me working on this much until next week, so we'll see what happens.
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