@V1RotateAP Thanks for the screenshots. That's exactly what I was looking for. Here is what I have been able to determine from my testing:
The standby alternator is energized, and contributing power to the aircraft.
The two annunciator lights are behaving correctly, as all conditions appear to be met.
Indications on the tablet are confused, because my variable L:var_AlternatorOnline is not true. We can see this with the red line through the ammeter (reading zero), which both rely on this variable.
There are two avenues we could pursue from here:
Why is L:var_AlternatorOnline not being set correctly, despite all conditions appearing to be met.
Why is the alternator energized to begin with.
I'm inclined to investigate the first point, since, technically, L:var_AlternatorOnline should have no impact other than the visuals displayed on the tablet, while the electrical system is causing the annunciators to illuminate, and causing unexpected electrical behavior.
Again, here is where I would suspect a hardware issue (even though I emulated this in my testing, and it caused L:var_AlternatorOnline to be set correctly.
To further test this, I would recommend temporarily binding a key combo to Toggle Alternator 2 in the simulator's controls menu. Then, try toggling the alternator manually and see what happens. Either, it will...
Toggle back on by itself.
Remain toggled off.
If #1, then it's more likely a code-side problem.
If #2, then it's more likely a user-side problem.
I really appreciate the help, and the testing above would provide exactly the kind of information I need next. Thank you so much!