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    escandon's Avatar
    escandon Posts: 1, Reputation: 1
    New Member

    Aug 1, 2008, 04:51 PM
    Old thermostat with two very short black wires
    I removed two very old round Honeywell mercury thermostats, I'm replacing them with Honeywell digital round thermostats.
    The instructions are easy to follow but I encountered two problems, 1) both wires are black and 2) the wires are too short and will not reach the screws in the mounting plate.
    So, how can I tell which wire is red or white? And how do I extend the length of the wires?

    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert

    Aug 1, 2008, 05:57 PM
    how do I extend the length of the wires?

    Add more wire

    So, how can I tell which wire is red or white

    It will not make a difference since there are only 2 wires to start with.

    I would read the directions VERY carefully to make sure that new thermostat
    Only requires two wires to operate.

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