Pramac
Low Output Voltage
Generator runs but voltage is low and lights are dim
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect AVR setting, Weak excitation due to failing AVR, High load causing voltage sag, Loose sensing wires to AVR
How to Fix / Troubleshooting
Safety first: Disconnect or reduce load before making adjustments. High voltage is present.
- Measure no-load voltage: With no load connected, check line voltage. If it is significantly below the nameplate value, suspect AVR or sensing issues.
- Inspect AVR sensing leads: Ensure the small gauge wires from the alternator output to the AVR are secure and not corroded.
- Adjust AVR (if allowed): Following the Pramac manual, adjust the voltage trim pot slightly while monitoring with a meter. Do not exceed rated voltage.
- Test under load: Reapply load gradually and observe voltage. If it collapses under modest load, the AVR or alternator may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Automatic Voltage Regulator (AVR)
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