Alternator for Mercruiser, OMC, Volvo Penta & Pleasurecraft Marine - 12V 55A
Alternator for Mercruiser, OMC, Volvo Penta & Pleasurecraft Marine - 12V 55A
SKU:400-46024
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Alternator for Mercruiser, OMC, Volvo Penta & Pleasurecraft Marine - 12V 55A
Mando-style inboard marine unit · Lester 12174 / 12177 · Arrowhead AMN0010
This alternator is built to OEM specifications as a direct fit and function replacement for Mando-style inboard and sterndrive marine engines from Mercruiser, OMC, Volvo Penta and Pleasurecraft. It is an IR/EF unit - internally regulated with an external fan - rated at 12 volts and 55 amps.
The unit rotates counter-clockwise (CCW) and uses a six-groove (S6) pulley, matching the original factory configuration for a straight bolt-in fit.
Key Features
- 12-volt, 55-amp output
- IR/EF design - internally regulated, externally cooled
- Counter-clockwise (CCW) rotation
- S6 (6-groove) pulley
- Mando-style inboard marine replacement
- 12-month warranty as standard
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Amperage | 55 Amp |
| Rotation | CCW (Counter-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 |
|---|---|
| Mercruiser sterndrive & inboard engines | Not specified - confirm against OEM part number |
| OMC marine engines | Not specified - confirm against OEM part number |
| Volvo Penta marine engines | Not specified - confirm against OEM part number |
| Pleasurecraft marine engines | Not specified - confirm against OEM part number |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| AC155616 | Mando |
| 3857813, 3860769 | Volvo Penta |
| AMN0010 | Arrowhead |
| 12174, 12177 | Lester |
Frequently Asked Questions
Will this alternator fit my marine engine without modification?
Yes. This is a direct OEM-fit replacement built to the same specification (12V, 55A, IR/EF, CCW rotation, S6 pulley) as the original Mando-style 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 - Mando AC155616, Volvo Penta 3857813 or 3860769, Arrowhead AMN0010, or Lester 12174 / 12177 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 counter-clockwise (CCW). 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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