Ron Francis Ignition column wiring

Many of the aftermarket replacement ignition switches have a extra smaller gauge black wire in the port where factory had placed the orange wire. Easiest fix it just use male female spade connectors to make up the orange connection beside the main connector. Let that extra black wire dead end where it is. Not all models have or use that extra smaller black wire.
If anyone has wiring diagrams for F-body, C-body, whatever that shows this 6th wire ( 18 ga black ) coming from ignition switch being used... I would love to learn where it went/what it was for.