How to Wire Two Doorbells to One Transformer | Home Guides Doorbells require electrical power, and that can be provided either by batteries or a transformer converting AC (alternating current) voltage into a much lower DC (direct current) voltage. The DC voltage produced by a transformer is identical to that produced by Wiring Diagrams for Household Doorbells - Do-it-yourself Wiring Diagram for a Two Chime Doorbell Wiring for two doors is the same as for one with the transformer hardwired to the 120 volt source from a house circuit. Connect the input wires on the transformer to the source circuit using the black to black, white to white, and ground to green method. How to install a second doorbell chime wiring diagram Click to view on Bing4:28To hook up a second doorbell in the basement, backyard or garage you will need to make sure the transformer can handle it. I was not able to find one at Home Depot, Lowes or Ace hardware. You need to make sure that the transformer can handle the load. In my case, I had 2 Author: AdamDIYViews: 175K Byron Doorbell Wiring Diagram Jan 01, · Wiring diagram for byron doorbell img source: wiringall Doorbell Wiring Diagrams doorbell wiring diagrams learn about every aspect of a low voltage wired doorbell system from how each ponent works and how they connect in various doorbell configurations wiring diagrams for doorbells do it yourself help doorbell wiring diagram a I have 2 Nest Hellos and I would like both to ring on the Hopefully this diagram will help others who are experiencing a lack of clarity on the wiring of two nest hello doorbells. I just had a technician leave after spending $111 for the correct wiring. My configuration: 2 wired doorbells with one manual chime. Rear on left, trans in middle, front on right. See attached photo. Hope this helps someone.