Alternator for Cummins Mercruiser EI/ES 165-300 2004-2005 - 12V 65A
Alternator for Cummins Mercruiser EI/ES 165-300 2004-2005 - 12V 65A
SKU:400-46025
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Alternator for Cummins Mercruiser EI/ES 165-300 2004-2005 - 12V 65A
Replaces Mercury Marine 807653 · Lester 12176 · Sierra 18-5967 / 18-5979 / 18-6265
This alternator is built to OEM specifications as a direct fit and function replacement for Cummins Mercruiser inboard and Mercruiser sterndrive engines. It is an IR/EF unit - internally regulated with an external fan - rated at 12 volts and 65 amps.
The unit rotates clockwise (CW) and uses a six-groove (S6) pulley, matching the original factory configuration for a straight bolt-in fit.
Key Features
- 12-volt, 65-amp output
- IR/EF design - internally regulated, externally cooled
- Clockwise (CW) rotation
- S6 (6-groove) pulley
- Direct fit for Cummins Mercruiser EI and Mercruiser ES models
- 12-month warranty as standard
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Amperage | 65 Amp |
| Rotation | CW (Clockwise) |
| Regulator | IR (Internally Regulated) |
| Fan Type | EF (External Fan) |
| Pulley Type | S6 (6-Groove) |
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 |
|---|---|
| Cummins Mercruiser EI 165, EI 250, EI 300 (inboard) | 2004-2005 |
| Mercruiser ES 165, ES 250 (sterndrive) | 2004-2005 |
| Mercruiser 454 cu in 7.4L V8 | 1993-2005 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 807653 | Mercury Marine |
| AC155616, AC165617 | Mando |
| 18-5967, 18-5979, 18-6265 | Sierra |
| AMN0005 | Arrowhead |
| 12176 | Lester |
Frequently Asked Questions
Will this alternator fit my Mercruiser engine without modification?
Yes. This is a direct OEM-fit replacement built to the same specification (12V, 65A, IR/EF, CW rotation, S6 pulley) as the original unit, so no modification is required.
How do I confirm this is the right unit for my engine?
Compare the number stamped on your existing alternator against the cross reference table above - Mercury Marine 807653, Mando AC155616 / AC165617, Sierra 18-5967 / 18-5979 / 18-6265 or Lester 12176 all indicate this unit.
What's included with this part?
You receive the alternator unit only. Mounting hardware and pulleys are not included unless already fitted to the original unit you are replacing.
How can I tell my old alternator has failed?
Common signs include a warning light staying on, dimming battery-charging performance, a dead or slowly draining battery, or unusual whining noises from the unit.
Why does rotation direction matter?
This unit rotates clockwise (CW). Fitting an alternator with the wrong rotation direction will not charge correctly, so always confirm your original unit's rotation before ordering.
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