Generator runs but the battery repeatedly goes flat between test runs.

Safety: Isolate AC supply to the charger before opening its cover. Observe polarity when working on DC circuits.

• Measure charger output: With AC supply on, measure DC voltage at the charger output. It should match the battery system voltage with a slight float increase.
• Check connections: Tighten DC output terminals at both charger and battery ends. Inspect for corrosion.
• Charger settings: Ensure the charger is set for the correct battery type (lead-acid, AGM, etc.) and voltage.
• Parasitic loads: Identify any devices connected directly to the battery that may draw current when the generator is off. Disconnect or rewire as appropriate.
• Replace charger or battery: If the charger is functioning but the battery will not hold charge, replace the battery. If the charger has no output, replace the charger.