Generator runs but controller shows E07 and the unit may shut down under load.

Safety first: Turn OFF the generator and disconnect it from all loads. Lock out the transfer switch so the generator cannot backfeed the utility. High voltage is present inside the alternator compartment; only work inside if you are comfortable with electrical safety.

• Verify with a meter: With the generator running in manual mode and no load, measure line‑to‑line and line‑to‑neutral voltages at the output lugs using a true RMS multimeter. Compare to the rated voltage (e.g., 120/240 V). If voltage is significantly low, proceed with checks.
• Inspect AVR connections: Shut down the unit and disconnect the battery. Open the alternator end cover to access the AVR. Check the plug‑in connectors and spade terminals for looseness or corrosion. Reseat all connectors.
• Check stator leads: Inspect the stator output leads where they connect to the terminal block and AVR. Tighten any loose screws and look for burnt insulation.
• Inspect brushes/slip rings (if used): If your WEN alternator uses brushes, remove the brush holder and inspect brush length and spring tension. Replace the brush set if worn below the minimum length. Clean slip rings with fine emery cloth.
• Replace AVR if needed: If wiring and brushes are good but voltage remains low, replace the automatic voltage regulator (AVR) with a WEN‑specified part.
• Retest: Reassemble, restart the generator, and recheck voltage. If still low, the stator windings may be damaged and require professional rewinding or alternator replacement.