Marine Alternator 12V 75A – Replaces Volvo Penta 3862665 / 3884950 | SKU 57-60073
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A direct-fit aftermarket replacement alternator for late-model Volvo Penta inboard and sterndrive engines using a 12-volt electrical system and 50mm multi-groove serpentine belt drive. This 75-amp unit replaces Volvo Penta OEM part numbers 3862665 and 3884950, and also cross-references Sierra 18-5882 and 18-6845. The serpentine pulley is included, making this a complete drop-in replacement with no additional hardware required. At 75 amps, this is a high-output unit well suited to Volvo Penta applications with moderate to heavy house loads.
Compatible Applications
- Volvo Penta 5.0L GXi, OSi, and FSi series sterndrives with 12V serpentine belt system
- Volvo Penta 5.7L GXi, OSi, and FSi series sterndrives with 12V serpentine belt system
- Volvo Penta 8.1L Gi and GXi series inboard engines
- Late-model Volvo Penta V8 and V6 marine engines equipped with 50mm multi-groove serpentine drive
- Cross-references: Volvo Penta 3862665, 3884950; Sierra 18-5882, 18-6845
- Confirm fitment against your engine serial number — belt groove count, pulley diameter, and mounting configuration must match
Replaces
- Volvo Penta OEM: 3862665, 3884950
- Sierra: 18-5882, 18-6845
Product Details
- SKU: 57-60073
- Voltage: 12V
- Output: 75 Amps
- Belt Drive: 50mm multi-groove serpentine
- Pulley: Serpentine pulley included
- Type: Aftermarket direct replacement
- Condition: New
Related Products — Volvo Penta Belts & Charging Accessories
- Volvo Penta Serpentine Drive Belt – 3860086
- Volvo Penta Serpentine V Belt – 21132390
- Volvo Penta Drive Belt 861564 – Marine Engine Serpentine Belt
- Volvo Penta Serpentine Belt Idler Pulley – 3861009
- Volvo Penta Idler Pulley – 3860201
- Marine Alternator 12V 55A – Replaces MerCruiser 817119A1 — lower-output option for other engine families
- Marine Alternator 12V 65A – Replaces MerCruiser 805447T
Parts Desk Insights
This is the correct unit for Volvo Penta owners who need a reliable, high-output replacement for a failed or underperforming alternator on late-model GXi and Gi series engines. The 75-amp output handles a full electronics complement comfortably — chartplotter, VHF, AIS, autopilot, and a 12V fridge running simultaneously won’t push this unit past 60–70% load at cruise RPM, which is exactly where you want it for long alternator life. The serpentine pulley is included, which saves you the hassle of pressing off and re-using the old pulley. When fitting, always replace the serpentine belt at the same time — a worn belt on a new alternator is a common cause of slip, noise, and premature bearing wear. Check the Volvo Penta serpentine drive belts and idler pulley in our Volvo Penta accessories. The cross-reference to Sierra 18-5882 and 18-6845 makes this easy to verify against your existing parts records if you’ve serviced this engine before.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.