Step 4: Test Transformer

electrician testing doorbell transformer with multimeter
Photo: Ryan Benyi
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You’ll find most doorbell transformers near the main electrical panel. Set the multimeter to voltage setting, and place its probes on the screws where the small-gauge doorbell wires are attached. If the multimeter reads 16 volts or so, the transformer is fine; go to Step 5. If it’s producing less than 16 volts, call an electrician to replace the transformer; this involves working with 120-volt wires and following the electrical code.
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    Tools List

    • multi-bit screwdriver
      Multi-bit screwdriver
    • multimeter
      Multimeter, available at home centers for about $15
    • wire strippers
      Wire stripper

    Shopping List

    doorbell button (if needed)

    18-gauge wire

    doorbell chime (if needed)

    electrical tape

    wire nuts