Steering column wiring

As stated above, the brake lamps and hazard flashers, headlights, horn, etc,,, are all hot at all times. The ignition switch has nothing to do with those circuits.
The ignition switch does power a portion of the fuse box which includes those accessories such as wipers, turn signals, radio, etc.
So inside the fuse box are 2 buss bars with 2 separate power sources. Actually a 3rd single terminal section of buss bar is in there too. It gets its supply from the park lamp section of your headlight switch.