Weird issue

[bd]

So in theory, I should be able to plug in the replacement to the connector on the lower column, and verify functionality.

If the symptoms persist, I save my self the trouble.

Yes.  But if the symptoms are intermittent, driving the vehicle that way until you're confident in the outcome might prove unsafe.

I was looking at the outboard connectors on the side of the step side to the light fixture, wondering if there were ground issues there, or others.

Your location description is unclear.  Nonetheless, ground issues anywhere can unnerve even the scariest ghosts.   BOO!   

[JohnnyPopper]

I LOL'd picturing driving around with a T/S flopping around the cab...

The location is on either side of the bed, nearest the light fixture. The wiring exits the bed into the light. I believe they are sealed spade connectors.