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Zero output from receptacles
Low output voltage with no load
6 Vac or above
Below 6 Vac
High output voltage with no load
Low output voltage under load
Erratic output voltage
Noisy operation
1. Engine speed is too slow
2. Open, shorted, or incorrect wiring
3. Faulty capacitor
4. Open/shorted rotor or stator windings
5. Open rectifier
1. Engine speed is too slow
2. Open rectifier
3. Faulty capacitor
4. Open/shorted rotor or stator windings
1. Generator head not magnetized
1. Faulty capacitor
2. Engine speed is too fast
1. Open rectifier
2. Engine speed too slow at full load
3. Excessive load applied
1. Surging engine
2. Dirty, corroded, or loose wiring
connection
3. Unbalanced load applied
1. Loose generator or engine bolt
2. Short circuit in generator field or load
3. Faulty bearing
1. Adjust engine speed ✽
2. Referring to the wiring diagram, clean
and reconnect all wiring ✽
3. Replace capacitor ✽
4. Test winding resistance, replace winding
if necessary ✽
5. Test rectifier, replace if necessary ✽
1. Adjust engine speed ✽
2. Test rectifier, replace if necessary ✽
3. Replace capacitor ✽
4. Test winding resistance, replace winding
if necessary ✽
1. Re-magnetize generator head ✽
1. Replace capacitor ✽
2. Adjust engine speed ✽
1. Test rectifier, replace if necessary ✽
2. Adjust engine speed ✽
3. Reduce the applied load
1. Refer to engine manual
2. Referring to the wiring diagram, clean
and reconnect all wiring ✽
3. Remove all loads, then apply each one
individually to determine which one is
causing erratic function
1. Tighten all mountings
2. Test winding resistance, replace field
winding if necessary✽
Test load devices for shorts. Replace
defective load device.
3. Replace bearing
✽ These diagnostic and repair procedures should be performed by an authorized service center.
Troubleshooting Chart
Symptom Possible Cause(s) Corrective Action
GN356402AC and GN356502AC
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