We performed a diagnostic and repair service on a Briggs & Stratton 20kW standby generator system in Montgomery. Our team inspected the external units, natural gas connections, and the internal control circuitry. We identified a failed battery with a significant casing crack that was preventing the system from operating reliably. After confirming the electrical output at the disconnect box and testing the charging voltage, we removed the damaged battery and installed a new unit. We verified the control panel functionality and ensured the automatic transfer switch components were receiving the correct voltage. This service restored the backup power system to full operational status for the homeowner.