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One moment Rick
Rick if you have air conditioning you will have two wires going outside to unit. One will connect to Y the wire is common you can 24 volt common there. Russ
Yes go ahead and send photo. Russ
Sorry Rick great info. Take the blue and connect to the brownand white wire nut. Take yellow connect to Red and you will have it. Russ
The brown wire going to white wire is the common or C you are looking for. Outside wire color codes differ depending on who installs them. Red and are used. Also Blue and yellow depending on make. Some use brown for common. Some Blue and some black.