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I am trying to change out my regular thermostat for my coleman a/c in my 5th wheel to a honeywell progammable, i know where all the wires go into the honeywell except for the gray wire, i have found mixed messages on the schematic on the gray wire, i think it goes to the low fan for the heat. and i just want to verify that the blue wire goes in as the common in the honeywell, can anyone help me?