ALTERNATOR FITS JOHN DEERE UTILITY TRACTOR 4100 YANMAR 20HP 101211-2200 101211-2201 100% NEW and Made with the Highest Quality Components Available Full One Year Warranty Computer tested for consistent Quality and unsurpassed reliability Alternator - Voltage: 12V Amperage: 55 Amps Fan: Internal Regulator: Internal Source: Aftermarket