Replacing Ignition Switch in 73 Duster

The old switch and the lock cylinder should have been removed in the on position and re assembled the same way. If you get a cog wrong you get your results. Keep in mind that I'm speaking general practice that applies t Ford, GM, all. I can't say for sure a mopar can be assembled a cog wrong but sure sounds like it.
As for the 6 fuse, I dont have a clue . sorry