I'm trying to install a new wifi thermostat, but am a little confused. I have 5 wires, but none are connected to the C in the thermostat, as seen below:
Additionally, when I trace the thermostat to inside of the Williamson furnace, it appears that the yellow/white wires are the ones connected to transformers, as seen below:
And here is the thermostat wire hooking into the "panel":
Is there a configuration of the existing wiring I can use to power the new thermostat? (I've also purchased a 24v transformer, but am unsure of how to complete the circuit if I add one of the wires to the C terminal.)