Thermostat Conundrum

Exactly, one wire is already connected to the transformer and goes to the thermostat. There is another terminal on the transformer which will have other wires on it presently, but a wire from the "C" terminal of the tstat goes to this transformer terminal as well

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RBM
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The thermostat will sometimes have a heat anticipator, a small heating coil driven by series current in the thermostat control loop. Newer thermostats often "rob" power from the furnace in much the same way to light their backlit display, power their electronics, and / or keep their programmable memory contents. Some furnaces cannot source enough current to properly drive the required power needed by the thermostat.

Smarty

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Smarty

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