You mentioned that you still have voltage at the resistors when the regulator is disconnected and the key is ‘off’. This tells me the Brown wire is still hot (battery voltage) with the key off still. Please double check this as this does direct you to something mis-wired or a issue at or near your ignition switch as others have indicated. This also means more work.

Make sure your wiring is the same at the diagram as this is what I am going by.

And to hopefully keep you from going crazy going back and forth between two pages, I colored the wires and pasted the two pages together. Unfortunately it is a little big.