Debugging no spark on '14 XC300

[CombatYoga]

In October of 2015 I was coming back to camp at the Zink Ranch NEPG and my '14 GG XC300 quit on me. Was able to determine that it was not sparking and got towed back.

A month or so prior to this, I was having intermittent spark issues. It turned out to be where the wiring harness plugged into the CDI. Someone else on the forum had the same problem and recommended bending the tabs to make a firm connection. That worked, and then I had the failure at Zink Ranch.

Because of the proximity of these events, I have made the assumption that the problem was again this interface. I have monkeyed with it to no avail.
I recently ordered a wiring harness off of ebay and spliced it in. Still no spark.
I purchased an in-line spark indicator with a light that blinks so that I can see if I'm getting a signal to the plug.

Any suggestions on how to proceed on debugging this?

Is there a fuse I should look for to see if it is blown? Is there a way to test the CDI? Could the stator be the problem? How does one test that?

Not very good with a voltmeter, but willing to learn.