I'm confused about some of the BKSQ variables.

[Black Square]

Great. Glad that wasn't too difficult. You are correct that there is only one breaker for all the cabin lights. When my failure code triggers a failure of the cabin lights, it will trip all six circuits off the bus. They only have to be separate because of how the lighting system works in MSFS. If I'm reading your message correctly, it sounds like the L:Var isn't changing when you click the breaker in the simulator?

[eracer1111]

I think that's exactly right.

IIRC I got those SIMCONNECT Vars from within Developer Mode (Tools -> Behaviors)
I think they are correct, since assigning button presses to them results the breaker tripping/resetting in the virtual cockpit.

But in SPAD Data Monitor 'CIRCUIT CONNECTION ON:40' isn't changing state.
Same for 41,42,43,44,45.

I'll look at Dev Mode to see whether the Vars are changing state there.