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Doorbell wires are numbered rather than labelled 'Front', 'Rear', & 'Transformer'. Which is which?

Home Improvement Asked by user3046757 on November 26, 2020

I’m trying to install a Ring Doorbell Pro.

The instructions to connect to the existing doorbell assume that the wires in the chime of the existing doorbell are labeled ‘Front’, ‘Rear’, & ‘Transformer’.

However, on my doorbell chime they are labelled ‘1’, ‘2’ & ‘3’.

Is this common? I can’t find any other reference online? Which number corresponds to which label?

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