Trying to install Ecobee adding my own C wire

I do have like 2 or 3 cables as spares behind the thermostat and at the handler. And it would be easy for me if i needed to put a new one in there and replace the old one if needed.

This is what i'm doing right now. Wish me luck lol

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@alexd51

Do you mind posting detailed photos of the wiring at your present thermostat, and the wiring you see at the air-handler/furnace that comes from the thermostat, and also comes from the outside unit?

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