The controller shows a LOW BATTERY VOLT or BATTERY LOW alarm; the generator may fail to crank or crank slowly.

Safety first: Turn OFF the generator and ensure it cannot auto-start. Wear eye protection when working around batteries.

Steps:

• Inspect battery: On the Gillette generator skid, locate the starting battery. Check for a swollen case, cracked housing, or leaking electrolyte. Replace if damaged.
• Clean terminals: Disconnect negative, then positive cables. Clean posts and clamps with a wire brush and baking soda solution if corroded. Reattach positive, then negative, tightening securely.
• Measure voltage: Use a multimeter to check battery voltage at rest. Below ~12.0 V indicates deep discharge. Charge the battery with an external charger to full capacity and retest.
• Check built-in battery charger: Many Gillette standby units include a float charger powered from utility AC. Verify AC supply to the charger and measure DC output (typically 13.2–13.6 V). Replace the charger if no output.
• Controller drain: If the battery repeatedly discharges, inspect wiring for added accessories and verify the controller goes into low-power mode when idle. A technician may be needed to trace parasitic loads.