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Got a new Honeywell WiFi thermostat and need to add a common. Currently the 3 common wires per the diagram (BL, BK, GY) are wired to one side of the AC Unit. Is there an issue if I piggy back a common off those wires (add a new wire to the wire nutted bundle).

Thanks!

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Go for it man

That's precisely the right move in your case -- that's where the system wiring diagram expects you to tap your C wire at.

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