This 12-volt, 100-amp alternator is a direct-fit aftermarket replacement for Ford and New Holland tractors, including the 5640, 5640SLE, 6640, 6640SLE, 7740 and 7740SLE, supplied with a 6-groove, 65mm OD pulley.
It is internally regulated with an internal fan (IR/IF) and features high-temperature epoxy, heavy-duty rectifiers and high-quality regulators for reliable charging in agricultural use.
Key Features
- Direct OEM-fit replacement for Ford/New Holland tractors
- Internally regulated with internal fan cooling (IR/IF)
- 6-groove pulley, 65mm OD
- High-temperature epoxy and heavy-duty rectifiers
- 1-year warranty
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
100A |
| Regulator |
Internal (IR) |
| Fan Type |
Internal (IF) |
| Pulley |
6-groove, 65mm OD |
| Weight |
16 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 |
| New Holland 5640 / 5640SLE |
- |
| New Holland 6640 / 6640SLE |
- |
| New Holland 7740 / 7740SLE |
- |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 400-30031 |
Arrowhead |
| 65GB-10300-LA |
Ford |
| F0NN-10B376-BB |
Ford |
| F2NN-10B376-AA |
Ford |
| 82003307 |
New Holland |
| 82010242 |
New Holland |
| MG15 |
Mahle |
| 12094 |
Lester |
| 112718 |
Cargo |
| 1-2454-01MM |
WAI |
| 54022443B |
Marelli |
| 63321285 |
Marelli |
| 63321346 |
Marelli |
| 63340015 |
Marelli |
| 63341285 |
Marelli |
| MAN786 |
Marelli |
Frequently Asked Questions
Will this fit without modification?
Yes, this is a direct replacement for the original Ford/New Holland alternator on the listed tractor models - no bracket or wiring changes needed.
What is included?
One complete 12V 100A alternator unit with 6-groove, 65mm OD pulley fitted, tested before dispatch.
How do I know my old alternator has failed?
Common signs are a charge warning light staying on, a battery that won't hold charge, dimming lights, or unusual noise from the unit.
Does this fit other Ford/New Holland models?
This unit is built to the same specification used across the 5640, 6640 and 7740 Series - check your original alternator's pulley and mounting dimensions against this listing before ordering.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
