I have 5 wires running to the thermostat from the furnace. The blue wire is not connected on either side. I'd like to connect it as my c wire for a smart thermostat.
On the furnace I see W R Y G and what looks like P on the top right. So no C. Am I out of luck or can I connect the C wire elsewhere?
Make and model of furnace: Trane electronic ignition xe 70