US88 Ignition switch - Starter stays running

This reminds me of a brand new Ford Ranger delivered to the dealership. Heat a/c blower ran on lower speeds but no air flow from any vent. Switch to blower high would blow a fuse. I found every wire in a 8 port harness connector in reversed positions. I think you are the victim of a temp worker on assembly line also, except your fault is where the wires are placed in the switch not the connector. Try another switch, from NAPA or maybe a different part store.