Thanks very much Don. As soon as I read your post I realized it must be an old phone line that is no longer used. There was a jack on the first floor in the kitchen that is no longer used/visible. I couldn't get to it in the attic to see it up close but the mystery is solved.Well it is definitely a low voltage wire. It could be a Cat5e data cable, UTP telephone line, Certainly a thermostat switch for either an air handler or attic fan.
You know it has to connect on both ends, where does it connect to in the attic?
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