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Originally Posted by Phobia
Forget which wires you think were hooked up to the old doorbell.
Take each wire from the 4 and touch the bare portion to every other wire.
When the doorbell starts chiming, you've found your 2 wires. Ignore the other two. Hook it up to your new doorbell and test it. A doorbell is an open circuit. When you push the button, you're closing the circuit.
Easiest thing in the world.
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As a backup plan if you get nothing from the wires buy a battery powered wireless doorbell.