Electrical Testing Techniques Mobile Generator
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3 Electrical Testing Techniques
3.1 Checking Continuity
Conduct continuity tests when the engine is shut down.
When checking continuity, use the Ohm setting on your multimeter.
Place a lead of the multimeter on one end of the wiring or component
and the other lead on the opposite end. If your meter reads “OL” or
“OPEN”, there is no continuity and the wiring or component must be
repaired or replaced.
Note: Some multimeters also have an audio signal setting for
determining continuity. This setting may also be used.
• If your meter reads less than 1.0 Ohm, or the audio signal
sounds, the wiring or component has continuity and should be
OK.
• If your meter reads more than 1.0 Ohm, the wiring is faulty and
must be repaired or replaced.
3.2 Checking Resistance
Conduct resistance checks when the engine is shut down.
Use the Ohm setting on your multimeter.
Conduct resistance checks when the machine is as close to 21°C
(70°F) as possible. Higher temperatures can affect resistance values.
Most digital multimeters have some internal resistance. To obtain your
multimeter’s internal resistance, simply cross the two leads of your
multimeter and read the display. When conducting a resistance check,
subtract your multimeter’s internal resistance from the value you
measure to obtain the true resistance of the component you are
checking.
3.3 Checking Voltage
Conduct voltage checks when the engine is running.
Use the Volt setting on your multimeter. To prevent damage to your
instrument, start with the highest scale available on your multimeter.
Adjust to a lower scale as readings dictate.
Use extreme caution when checking voltage to reduce the risk of
electric shock.
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