Generator Fault Finding
Generator Running But No Power
What can cause a running generator to produce no electrical output.
Diagnosis matters
What may be causing the fault?
If the engine runs but the load receives no power, the fault may be in the AVR, alternator, excitation circuit, breaker, wiring or control system.
Generator systems combine engine, fuel, electrical generation, control and protection systems. A symptom alone does not identify the failed component. Testing the relevant circuits and operating conditions is the safer way to determine the repair.
What a technician may check
- Battery and starting system
- Fuel supply and fuel-system components
- Engine protection and shutdown signals
- Control panel and fault indications
- Alternator and AVR circuits
- Output voltage and frequency
- Cooling and mechanical condition where relevant
Need help?
Describe the generator fault
Tell us what happens when you try to start or run the generator and where the generator is located.