The doorbell to my rental apartment stopped working. Knowing the simple button is the most likely point of failure I pulled it off and shorted the wires. It did not ring. So I went down to the cellar and found the transformer mounted on the side of a circuit breaker panel. Using my voltmeter I tested the voltage. None to speak of. So I replaced it. Again, no measurable voltage. Could a wire be bad? This made no sense. So I called my electrician. He said that these transformers are like that. And to test it put a screwdriver across to short the terminals. See a spark and it is okay. Hmm... So I pulled it off the panel and connected some wires to it and plugged it in. No reading on the voltmeter. If I can't measure a voltage how am I going to test for what went bad in the circuit?
Don .