This alternator is built for John Deere agricultural, industrial and marine equipment from 1989-2006, supplied as a direct replacement for the original equipment unit. It is a high-output 12-volt, 120 amp alternator with an internal regulator (IR) and external fan (EF) cooling.
It is manufactured to OEM specifications, with high-temperature epoxy and heavy-duty rectifiers for durability, a 56mm bottom mount matching the original bracket. The original equipment had an unthreaded top ear, but this threaded top ear replacement fits without issue in place of it.
Key Features
- 12-volt charging output
- 120 amp rated alternator
- 56mm bottom mount
- Threaded top ear (fits in place of original unthreaded ear)
- Internal regulator (IR), external fan (EF)
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
120A |
| Bottom Mount |
56mm |
| Top Ear |
Threaded (replaces unthreaded OE ear) |
| Regulator |
Internal Regulator (IR) |
| Fan Type |
External Fan (EF) |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| John Deere Agricultural, Industrial & Marine Equipment |
1989-2006 |
| John Deere 4435 Combine |
1990 onwards |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| AE53101 / AL78689 / AL78692 / AL81438 / TY6777 / TY6779 / TY6793 |
John Deere |
| 0-120-484-012 |
Bosch |
| MG251 |
Mahle |
| IA0989 |
Iskra / Letrika |
Frequently Asked Questions
Will this fit my equipment without modification?
Yes, this alternator is manufactured to OEM specifications for direct bolt-in fitment - the threaded top ear fits in place of the original unthreaded ear without issue.
What is included?
One new 12-volt, 120 amp alternator, ready to fit.
How do I know my old alternator has failed?
Common signs are a dashboard charge warning light, dimming or flickering lights, a weak or dead battery despite the engine running, or a whining/growling noise from the unit.
Does this fit marine as well as agricultural and industrial applications?
Yes, this alternator covers John Deere agricultural, industrial and marine equipment built to the same 12-volt 120 amp specification across 1989-2006, including the John Deere 4435 Combine.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
