How To Measure Voltage

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The following procedure measures the voltage at a selected point in a circuit.

  • Disconnect the electrical harness connector for the circuit being tested, if necessary.
  • Enable the circuit and/or system being tested. Use the following methods:
  • Turn ON the ignition, with the engine OFF.
  • Turn ON the engine.
  • Turn ON the circuit and/or system with a scan tool in Output Controls.
  • Turn ON the switch for the circuit and/or system being tested.
  • Select the V (AC) or V (DC) position on the meter.
  • Connect the positive lead of the DMM to the point of the circuit to be tested.
  • Connect the negative lead of the DMM to a good ground.
  • The meter displays the voltage measured at that point.

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