Correct. . where the rotor meets the cap and the other end goes to the spark plug wire electrode..

I don;t remember the color of the spark, but it was weak. Between the two ends of the rotor is a silicon like substance. The rotor usually burns up under the silicon and is undetected by the visual eye. In my case, I replaced it and the car started right up.
My cap was very good. Did not replace it..Only the rotor.
Felt very dumb afterwards when it worked..

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99 C230K Sport
87 300SDL
81 300SD