Controller displays E10, generator shuts down during cranking or shortly after start

Safety first: Set the controller to OFF and open the generator AC breaker. Avoid shorting battery terminals.

• Measure battery voltage: Use a multimeter to check battery voltage at rest. If below 12.0 V, charge the battery with an external charger or replace it if more than 3–5 years old.
• Inspect onboard charger: Locate the Champion battery charger module inside the generator. Confirm its AC supply fuse or breaker is not tripped and that its DC leads are firmly attached to the battery.
• Check charger output: With utility power present and the generator off, measure voltage at the battery. It should be around 13.2–13.6 V if the charger is working.
• Clean terminals: Remove corrosion from battery posts and cable ends with a wire brush. Reinstall and tighten securely.
• Limit crank attempts: Avoid repeated long crank cycles; allow the starter to cool between attempts to prevent further battery drain.

If the charger has no output with proper AC supply, replace the Champion battery charger module.