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1. Turn off all power to the circuit you want to test. If the circuit has a built-in power storage device, like a capacitor, discharge the electricity from the circuit before testing.
2. Plug the black lead into the common terminal (marked "CDM") on the voltmeter. Plug the red lead into Volts/Ohms terminal (marked with a "V" or a "V" and the Greek letter omega, the symbol for "ohms") on the meter.
3. Turn the voltmeter on. The meter will automatically select a range, or you can manually select Volts AC, Volts DC, Amps AC or Amps DC.
4. Touch the black lead to one end of the circuit you are testing. Touch the red lead to the other end of the circuit. If the voltmeter shows less than 210 ohms of resistance, continuity exists.
5. If the resistance is higher than 210 ohms, you can move the leads to isolate the break in continuity, until you come to a point where the resistance is less than 210 ohms, indicating continuity in the circuit between the red and black leads.
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