I'm hooking up a SkyBell WiFi Video Doorbell and it requires use of a wired doorbell system (it uses the power from the doorbell's transformer). We're rehabbing the house and it had a spot for a wired doorbell/transformer and the wiring to the doorbell button, but no longer had a actual doorbell, transformer or button. I purchased a wired doorbell contractor kit to install and am having some issues. I connected all the wires for the transformer and doorbell, and confirmed there is power going to the transformer. However, when I tap together the exposed ends of the wire outside where the doorbell goes the doorbell doesn't ring. Its possible that I either have bad wiring, or have chosen the wrong one. There were two sets of doorbell wires going to the doorbell/transformer spot (one for the front of house, and a second set for probably the side/back). 2 questions: 1) Is there a way I can test to see if I'm use the right set of wires for the front of the house? 2) How can I confirm that the correct set of wires is capable of carrying a signal (ie. its not damaged or too old)?