I'm trying to install a Google Nest doorbell. I opened up the doorbell chime, and it looks nothing like the diagrams I've found online. I have no clue how to install the chime connector, which is supposed to be the first step of installation.

Currently there is a working front and back doorbell.

Please see the diagram below:

enter image description here

There are 6 wires total: 3 white, 3 black. There are 4 screws, labeled 0, 1, 2, and T. The 3 white wires are all going to 0.

Any help would be appreciated in knowing how to install this, or just knowing what the screw numbers mean. Thanks!

  • Are there multiple buttons that activate the bell? – JPhi1618 Jul 9 '19 at 2:42
  • There's one for the front, and one for the back. – David Liao Jul 9 '19 at 11:40

Does your doorchime do a ding-dong for one door, and a dong for the other door? If so, it looks very similar to the wiring here:

Wiring Diagram

Friedland Doorbell Manual

0 (top left) is common and not connected to anything inside the chime

T or 3 is transformer (which Google Nest may call TRANS)

1 is push for door 1 (which Google Nest may call FRONT)

enter image description here

2 is push for door 2 (or REAR, leave this wire connected to 2)


  • Good find on that manual - I've added an image of the wiring diagram inline with your answer incase that PDF link dies in the future. – JPhi1618 Jul 9 '19 at 14:30
  • Thanks, I will try this and get back to you to see if it worked later today – David Liao Jul 9 '19 at 14:34
  • So I dont touch anything to do with 0 and 2, correct? – David Liao Jul 9 '19 at 14:53
  • I don't think so, but I can't guarantee that your doorchime is the same. – Owain Jul 9 '19 at 18:10
  • Thanks for the diagram. The front happened to be 2 and the rear was 1. However there is another problem: the voltage isn't high enough for the Google Nest. This is a different issue though, I'll mark your answer as correct – David Liao Jul 13 '19 at 19:37

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