I'm looking to upgrade my old thermostat and need to run a c-wire. Where would be the best place to tap into?
Where to add a c-wire on the Goodman furnace
furnacethermostat-c-wire
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Best Answer
Connect it to the junction of the fat blue wire and the skinny white wire
We know the fat blue wire in the foreground is a C wire, as it's currently returning current from the air conditioner compressor contactor (via chassis ground, which is odd, but it's what the wiring diagram on this unit calls out) already. The easiest place to splice into it is at the existing wirenut junction, although it appears you may have to hunt around for a spare wire in your existing cable if one is present but not visible, or pull a new thermostat cable if your existing one has no spare wires in it.