1985 500SEL.

For whatever reason my W126 continues running with key removed and the ACC engaged/on. Push the button to turn off the ACC and it shuts down. I'm used to it so I don't care but it has resulted into some panicked calls from friends who have borrowed the car.

Any ideas? I'm sure it is back feeding somewhere through a relay but I'm stumped as to which one or ones.

It has a new ignition switch due to a different problem but it did it before and after the switch was replaced.

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