I think I found the switch. It's on the top curve of the steering column located under the dash and just before the fire wall. It is riveted by one hole both sides. I can grind off the rivets, but I have no idea where they'd end up inside the column (I hope they'll fall out). As for the next guy who maybe does this repair, is there some procedure for replacing it using something other than a rivet?

I still need to test the switch. Does this sound right: I intend to just pull the two plugs and see if the light goes out. If yes, the switch is stuck on. I can't test it yet though, because its about ten (10) degrees F in my garage. Not good for the wires so I'll wait for a much warmer day.