Alternator for John Deere Marine 8.1L & 12.5L Engines 2004-2007 - 12V 140A
Alternator for John Deere Marine 8.1L & 12.5L Engines 2004-2007 - 12V 140A
SKU:400-52217
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Alternator for John Deere Marine 8.1L & 12.5L Engines
12-Volt, 140 Amp High Output · Replaces John Deere RE500226
This alternator is a direct OEM-fit replacement for John Deere marine engines built between 2004 and 2007, covering the 8.1 litre 6081AFM75 and the 12.5 litre 6125AFM75 and 6125SFM75. It is built to the original 12 volt, 140 amp high-output specification and replaces John Deere part number RE500226.
The unit turns clockwise on an 8-groove serpentine (S8) pulley of 62mm outside diameter, and is internally regulated (IR) with an internal fan (IF), matching the factory mechanical and electrical fitment so no modification is needed. On marine installations a healthy high-output alternator is what keeps engine electronics, domestic batteries and navigation equipment supplied under load.
Key Features
- 12V, 140 Amp high output
- Clockwise (CW) rotation
- 8-groove serpentine pulley (S8), 62mm OD
- Internally regulated with internal fan
- Direct fit for John Deere 8.1L and 12.5L marine engines
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Amperage | 140A |
| Rotation | Clockwise (CW) |
| Pulley | S8, 8-groove, 62mm OD |
| Regulator | Internally regulated (IR) |
| Fan Type | Internal (IF) |
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 Marine 6081AFM75, Code 3103 (496ci 8.1L 6-cylinder) | 2004-2007 |
| John Deere Marine 6081AFM75, Code 3117 (496ci 8.1L 6-cylinder) | 2004-2007 |
| John Deere Marine 6125AFM75, Code 3107 (763ci 12.5L 6-cylinder) | 2004-2007 |
| John Deere Marine 6125SFM75, Code 3107 (766ci 12.5L 6-cylinder) | 2004-2007 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| RE500226 | John Deere |
| 101211-7780 | Denso |
| AND0539, ND101211-7780 | Arrowhead |
| 8M6007489 | QuickSilver |
| 12658 | Lester |
| 12658N | WAI |
Frequently Asked Questions
Will this alternator fit my engine without modification?
Yes, it is built to the original John Deere marine engine specification and fits using the factory mounting points and pulley.
What is included?
One complete alternator unit, ready to fit.
How do I know my old alternator has failed?
Signs include a charging warning light, low or fluctuating voltage, dimming instruments, or a flat battery after running.
Is this the 12-volt or 24-volt version?
This is the 12-volt, 140 amp version replacing John Deere RE500226. A visually similar 24-volt 60 amp unit (RE65414) is also used on these engines, so please confirm your system voltage and the number on your original alternator before ordering.
Will it charge a larger domestic battery bank?
At 140 amps this is the high-output unit specified for these engines, so it has the capacity for engine and domestic loads within the original system design.
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