Some switches do have a polarity that they want the wiring connected. If your new switch is one of these, it will have noted so on the package and on the switch...should tell you which connection would be battery in and switched power out.
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.