Generator output voltage fluctuates or is unstable under steady load, no AVR fault code

Safety first: Isolate the generator from the load and verify absence of voltage before opening the terminal box.

• Inspect connections: Tighten all power and sensing connections in the generator terminal box and at the AVR.
• Check AVR: Look for signs of overheating or damage on the AVR. Verify that its mounting and grounding are secure.
• Brush/slip ring (if applicable): Inspect brushes and slip rings for wear or contamination. Clean and replace as needed.
• Evaluate load: Determine if non-linear loads (e.g., VFDs) are causing voltage distortion. Consider adding filtering or separating such loads.
• Test with resistive load: Run the generator with a stable resistive load bank to see if voltage stabilizes. If not, replace the AVR.