Ignition switch wiring

[DuallyFlatbed]

My new to me truck has some electrical fire issues the PO had. I believe it has to do with the ignition job he did.

Heres a pick of how im wired now. The wiring diagram has brown and purple together, which mine does not. This isnt the factory switch so im alittle confused on the locations.

I have (going clockwise) Red on "bat"(yellow collar) , tan and brown on "Acc", pink on "Ign", and (in middle) purple on "St".

The stray frayed wire comming from "Acc" was the "brake warn light", it got incenerated all the way to the fuse box. I did away with the wire completly and said forget the brake light, i'd rather my truck not burn down than risk recreating a fire. So i guess i can ditch the other tan wire on "Acc", its for the brake light too.

Questions....

On the factory diagram, which termanals are which?

Im good ditching my brake light warning setup right? No other systems connected?

What is "St" on my ignition stand for?

I know im missing the resistance wire for the alternator, it wasnt included by the PO. According to the diagram it should go to the purple wire also shouldnt it?