Most doorbell problems are caused by loose wire connections or worn-out switches. To test your system, you will need a multitester, which checks voltage and continuity.

Object Details maker Ray, Joseph J. Description For his teaching machine (known to him as the multitester), Joseph Ray used long strips of cardboard with twenty pairs of words or pairs of images ...

Object Details maker Ray, Joseph J. Description For his teaching machine (known to him as the multitester), Joseph Ray used long strips of cardboard with twenty pairs of words or pairs of images ...