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I’m trying to add c wire to furnace to run a WiFi thermostat but don’t know where to hook up c wire to get power to turn on thermostati have 2 extra wires just don’t know where to put one them to get powerenter image description hereenter image description hereenter image description hereenter image description here

marked as duplicate by Tyson, Daniel Griscom, ThreePhaseEel, mmathis, Tester101 May 30 '18 at 16:09

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  • Model #s of furnace and thermostat would be helpful. – manassehkatz May 27 '18 at 18:13
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    Can you post the wiring diagram of the furnace? – ThreePhaseEel May 27 '18 at 18:15
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A wiring diagram would be helpful. In leu of that , the transformer has 4 terminals. Two on the high voltage side and two on the low voltage side. It looks like the black and yellow wires on the transformer are the high voltage wires. The other side has a red with an inline fuse and a brown and green in the same terminal. The green goes to ground. The brown should be the common. There is likely a convenient place somewhere along this wire to hook to. The pictures aren’t too clear however so this should be verified with a wiring diagram.

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