This 12-volt, 120-amp alternator is built to OEM specifications for John Deere and New Holland agricultural and marine applications. It uses the internally regulated, externally fanned (IR/EF) design fitted as standard on these machines, and includes flame arrestor screens where applicable to meet Marine SAEJ1171 certification standards.
It is built as a fit-and-function replacement for the original equipment alternator, with the same 51mm bottom mount and 8-groove pulley as the factory unit, so it bolts straight in without rewiring or bracket changes. The regulator is mounted internally, keeping the harness connections identical to the original alternator.
Key Features
- 12-Volt, 120-Amp output rating
- Internally regulated, externally fanned (IR/EF)
- 51mm bottom mount for direct bolt-up
- 8-groove pulley
- Direct OEM fit and finish
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
120A |
| Rotation |
Clockwise (CW) |
| Regulator |
Internally Regulated (IR) |
| Fan Type |
Externally Fanned (EF) |
| Bottom Mount |
51mm |
| Pulley |
8-groove |
| Weight |
14.00 lbs |
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 4045DFM70 Marine Engine (Code 3108, 4.5L 4-cyl) |
2004-2007 |
| John Deere 6068TFM76 Marine Engine (Code 3141, 6.8L 6-cyl) |
2004-2007 |
| Chevrolet C Series/C60 Medium-Duty Truck (5.7L V8) |
1990 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| AE52707 / AT185951 / SE501343 / TY24486 |
John Deere |
| 86537977 / 86577814 / 87020406 |
New Holland |
| 9-120-060-042 / F-005-A00-025 |
Bosch |
| 12372 / 12373 |
Lester |
| 1-2500-31BO |
WAI |
Frequently Asked Questions
Will this fit without modification?
Yes. This alternator uses the same 51mm bottom mount, 8-groove pulley and IR/EF configuration as the original New Holland unit, so it bolts straight in.
What's included?
One complete 12-volt, 120-amp alternator, ready to fit.
How do I know my old alternator has failed?
Common signs include a charge warning light staying on, a battery that won't hold charge, dimming lights, or a whining/grinding noise from the unit.
Why is the amperage so high on this unit?
120 amps reflects the higher electrical demand of the John Deere and New Holland applications this alternator is built for, matching the original equipment rating.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
