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 · You can use a standard Multimeter to check the voltage for the wires at your Door Bells The voltage should measure between 12~24VAC If the measured voltage is less than 12V AC, we recommend changing old doorbell's transformer with a MultiVoltage Wired Doorbell Transformer or using a 12VDC, 10A AC/DC adapterAll, I replaced my doorbell transformer and got 22V (which was odd since it is supposedly a 16V transformer) with no wires connected to the transformer As soon as I connect the wires to the transfomer that run to the chime the voltage drops to 2V or soMost doorbells run on low voltage electricity These installations require a transformer and, often, holes to be drilled in floors and door frames NuTone's new Line Voltage Doorbell connects directly to the line voltage of the home and does not require an external transformer, How To Fix A Broken Doorbell In 6 Easy Steps This Old House Old doorbell transformer voltage