This alternator is built for John Deere marine engines, covering the 4039, 4045, 6068 and 6076 engine families, engineered to OEM specifications for a direct fit and function replacement on these applications. It is designed as a direct swap for the original equipment unit, using the same mounting points and drive arrangement so no bracket changes are needed.
It delivers a strong 90 amp output at 12 volts, giving plenty of headroom for onboard electrical and marine electronic loads. It uses bi-directional rotation with an external fan for cooling, and is internally regulated (IR), so it operates as a self-contained unit without a separate external regulator.
Key Features
- Built for John Deere marine engine applications
- Fits 4039, 4045, 6068 & 6076 engines
- 12 volt, 90 amp output
- Bi-directional rotation
- Internally regulated with external fan (IR/EF)
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
90A |
| Rotation |
Bi-Directional |
| Fan Type |
External (EF) |
| Regulator Type |
Internal (IR) |
Vehicle Fitment Guide
| Make & Model |
Years |
| John Deere Marine Engines (4039, 4045, 6068, 6076) |
Not specified by supplier |
OEM Part Number Cross Reference
No OEM cross reference is published for this part.
Frequently Asked Questions
Will this fit without modification?
Yes, this alternator is built to OEM specifications for a direct, bolt-in fit on covered John Deere 4039, 4045, 6068 and 6076 marine engines.
What's included?
You receive one fully assembled 12V 90A alternator, ready to install.
How do I know my old alternator has failed?
Common signs include a charge warning light staying on with the engine running, dimming or flickering lights, a battery that will not hold charge overnight, or an unusual whining or grinding noise from the unit as it turns.
Which engines does this cover?
This unit is built for John Deere marine 4039, 4045, 6068 and 6076 engines as listed by the supplier.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
