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GN5060, GN6575
Troubleshooting Chart
Symptom Possible Cause(s) Corrective Action
Engine will not
start
1. Run switch is set to "OFF".
2. Fuel valve is turned to "CLOSE".
3. Choke is open.
4. Fuel tank is empty.
5. Engine is filled with
contaminated or old gas
6. Spark plug is dirty.
7. Spark plug is broken.
8. Unit is not on level surface.
9. Oil is low.
1. Set run switch to "ON".
2. Turn fuel valve to "OPEN" position.
3. Close the choke.
4. Add gas.
5. Change the gas in the engine.
6. Clean spark plug.
7. Replace spark plug.
8. Move unit to a level surface to prevent low oil shutdown from
triggering.
9. Add or replace oil.
Engine runs
but there is no
electrical output
1. Main or secondary circuit
breaker(s) are tripped.
2. Bad connecting of wires / cables.
3. Bad electrical device connected
to generator.
1. Reset main or secondary circuit breaker(s).
2. If you are using an extension cord, try a different one.
3. Try connecting a different device.
Generator runs
but does not
support all
electrical devices
connected.
1. Generator is overloaded
2. Short in one of the connected
devices.
3. Air cleaner is dirty.
1. Turn off all electrical devices. Unplug all electrical devices. Turn
off generator. Wait several minutes. Restart generator. Try
connecting fewer electrical loads to the generator.
2. Try disconnecting any faulty or short-circuited electrical loads.
3. Clean or replace air cleaner.
No output
voltage
1. Engine speed is too slow
2. Open, shorted, or incorrect
wiring
3. Faulty capacitor
4. Open or shorted field windings
5. Open diodes
6. Circuit breaker tripped
1. Adjust engine speed. ★
2. Referring to the wiring diagram, clean and reconnect all
wiring. ★
3. Replace capacitor. ★
4. Test winding resistance, replace field winding if necessary. ★
5. Test diodes, replace if necessary. ★
6. Reset circuit breaker.
Low output
voltage with no
load
1. Engine speed is too slow
2. Open diodes
3. Faulty capacitor
4. Open or shorted fi eld windings
1. Adjust engine speed. ★
2. Test diodes, replace if necessary. ★
3. Replace capacitor. ★
4. Test winding resistance, replace field winding if necessary. ★
High output
voltage with no
load
1. Faulty capacitor
2. Engine speed is too fast
1. Replace capacitor. ★
2. Adjust engine speed. ★
Low output
voltage under
load
1. Open diode
2. Engine speed too slow at full
load
3. Excessive load applied
1. Test diodes, replace if necessary. ★
2. Adjust engine speed. ★
3. Reduce the applied load.
Erratic output
voltage
1. Unbalanced engine
2. Dirty, corroded, or loose wiring
connection
3. Unstable load applied
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.
Noisy operation 1. Loose generator or engine bolt
2. Short circuit in generator field or
load
3. Faulty bearing
1. Tighten all mountings.
2. Test winding resistance, replace fi eld winding if necessary.
★
Test load devices for shorts. Replace defective load device.
3. Replace bearing.
Auto-Idle does
not work
1. Damaged or disconnect wire in
idle control circuit.
2. Failed idle control circuit board.
3. Failed current sensing coil.
1. Repair or replace wiring.
2. Replace idle control board.
3. Replace current sensing coil.
★ These diagnostic and repair procedures should be performed by an authorized service center.