I have a mobile home furnace. This furnace only has a 4 wire connection terminal, G,W,R,Y. I also have a condensing unit outside with the 24 volt 2 wires coming to the furnace. I know I connect one to Y, but I don’t know what to connect the other wire to? Yes my furnace is AC ready.
It's the grey wire in the thermostat wire bundle
According to the wiring diagram posted for your furnace, the C wire should be the grey wire in the thermostat wiring area of your furnace. So, you should just be able to connect to that.