Wacker Neuson
Unstable Voltage Regulation
Generator output voltage is present but fluctuates significantly under steady load
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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
Failing AVR, Poor AVR grounding, Loose sensing wires, Worn brushes/slip rings (on brush-type alternators)
How to Fix / Troubleshooting
Safety first: Disconnect sensitive loads before troubleshooting voltage instability.
- Inspect AVR connections: Tighten all terminals and ensure the AVR ground is secure to the frame.
- Check sensing leads: Verify that voltage sensing wires are correctly connected and not shared with high-current paths.
- Brush and slip ring inspection: On brush-type alternators, inspect brushes for wear and slip rings for heavy scoring. Replace brushes and clean rings as needed.
- Replace AVR: If connections and brushes are good but voltage still hunts, replace the AVR with the correct Wacker Neuson part.
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Repair Difficulty
Hard
4/5
Required Part
Automatic Voltage Regulator (AVR)
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