Key on and cranking power wire?

mopar65 said

The blue or blue/white strip wire is your 12V with key on and the brown wire is your 12V start wire.

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That's what I originally thought, but to have two cars in a row where the brown wire doesn't have power in the crank position made me think that maybe I was missing something.

I still need to go out to the '71 D100, that is the next magnum swap, and see if I can find a crank position power wire.