I always look at the oldcarmanualproject wiring diagrams. I can never read them much. I will save Tim's link for a clear diagram. Thanks Tim.
You can see that the ignition switch power feed is chained in with other power, including ignition switch. Something is crossed somewhere. You need to trace all associated wires using Tim's diagram.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn