You verified power to the coil and disty while searching for what turned out to be a bad coil wire. When you had the second problem, did you re-verify power to the ignition components?
Seems unlikely that it would be good yesterday and bad today, but it's quick and easy to check.
If you do have power there, then the kill switch isn't the issue. They are notorious for causing exactly what you are seeing though.
BTW, your sig pic - Tahoe?
Don
'01 22 Classic, 502/B1
And a bunch of other stuff
"If everything seems under control, you're just not going fast enough" - Mario Andretti