1976 Dart - ignition switch

The key comes out as seen in the photo, rotated fully CCW. There are 4-positions.

View attachment 1716293516

That is off.

Here is mine in ACC.

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Note that it is stiff and I had to wiggle the key to get it there. But that's where ACC is.

I meant to check, but my bet is that the "position" you are feeling between off and run isn't a position at all.