LVA12357: Alternator with Sealed Regulator, 12 Volt, 40 Amp12 Volt and 40 Amp John Deere Alternator is designed to charge the battery and provide power to your machine under various operating conditions. Reliability: John Deere Alternators are built to meet high standards and ensuring reliable performance. Voltage regulation: Maintains a consistent voltage output to ensure the battery is charged correctly and the electrical components receive the proper voltage. Durability: Built to withstand harsh operating