Okay. That probe really is quite useful.
When the signal cuts out, it’s right at BI on the 3PDT.
The I still has a signal, but BI doesn’t have one.
Does that mean I need to pick up another 3PDT? I might actually have a few more lying around somewhere. Maybe the first step would be replacing that one wire I burned? Could be a problem, but there isn’t any wire showing through.