A direct-fit replacement 12V 120A alternator for John Deere agricultural, industrial, and marine engine applications produced between 1989 and 2006. The alternator generates AC electricity as the engine runs, which is converted to DC power to charge the battery and supply the vehicle's electrical system. A failing alternator typically presents as a flat battery that will not hold charge, dimming lights under load, or complete electrical failure even with a known good battery.

Manufactured to OEM specification with internal regulator, external fan, clockwise rotation, and 56mm bottom mount, cross-referencing John Deere OEM part number AL78692 for straightforward identification. Note: original units had an unthreaded top ear - threaded top ear replacements are confirmed compatible. Verify your model and year against the fitment table before ordering.

Key Features

• Direct OEM-specification replacement alternator
• 12V / 120A output - clockwise rotation - external fan - internal regulator
• 56mm bottom mount - threaded top ear replacement compatible with original unthreaded top ear units
• Covers John Deere agricultural, industrial, and marine applications 1989-2006
• Replaces John Deere OEM part numbers AL78692, AL78689, AL81438, AE53101, AZ38462, TY6777, TY6779, and TY6793

OE Reference Numbers

Specifications