August 2016Section 4 • Repair Procedures
4 - 10 AL4 • AL4000 Part No. 218567
How to Check a
Generator Capacitor
DANGER
High voltage. Exposure to
electrical wires or electrical
current will result in death or
serious injury. Remove all rings,
watches and other jewelry. Turn
off all power when not needed
for testing. Use extreme caution
when working with high voltage
electrical components.
DANGER
Electrocution/burn hazard.
Attempting to service the machine
before the capacitor is fully
discharged will result in death or
serious injury.
Note: Be sure the engine has been turned off for
at least 15 minutes before servicing the machine.
Use a voltmeter to confi rm there is no residual
voltage in the capacitor.
1 Remove the generator capacitor cover.
2 Using an insulated conductor or a screwdriver
with an insulated handle, discharge the
capacitor by shorting across the capacitor
terminals. Repeat for the second capacitor, if
equipped.
DANGER
High voltage. Exposure to
electrical wires or electrical
current will result in death or
serious injury. Remove all rings,
watches and other jewelry. Use
extreme caution when working
with high voltage electrical
components.
3 Tag and disconnect the wires attached to the
capacitor(s).
4 With an ohmmeter set to its highest resistance
scale, connect the ohmmeter leads to the
capacitor terminals and observe the reading on
the meter. Then, reverse the connections and
observe the reading on the meter.
Result: The meter indicates a very low
resistance which then gradually increases AND
a very high resistance which then gradually
decreases. The capacitor is working.
Result: The meter indicates a very high
resistance which does not decrease. The
capacitor is faulty and should be replaced.
Result: The meter indicates a very low
resistance which does not increase. The
capacitor is faulty and should be replaced.
GENERATOR
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