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Alternators

Marine Alternators & Charging System Parts

Shop Marine Alternators & Charging Components

Find marine alternators, high-output alternators, voltage regulators, pulleys, brackets, serpentine belt components, and charging-system accessories for inboard, sterndrive, and diesel engines. Search by part number, engine brand, amperage, voltage, or product type to keep your batteries charging reliably.

Shop Alternators Search Marine Alternators Voltage Regulators
Fitment Reminder

Confirm part number, engine model, mounting style, pulley type, amperage, and voltage before ordering.

Shop High-Output Alternators

Always verify alternator fitment using your engine serial number, OEM part number, pulley alignment, and charging-system requirements.

Volvo Penta Yanmar Mercury MerCruiser Sierra 12 Volt 75 Amp Serpentine Pulleys

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Shop by Charging Category

Choose the alternator or charging-system component that matches your engine, belt drive, and onboard electrical load.

All Alternators Marine Alternators High-Output Alternators Voltage Regulators Alternator Pulleys Mounting Brackets Charging Accessories

Why It Matters

Alternators Keep Your Boat's Electrical System Supplied

A marine alternator charges batteries and helps support electrical loads while the engine is running. Weak output, bearing noise, belt issues, or regulator problems can leave batteries undercharged.

Marine-grade alternators and charging parts are built for engine-room heat, vibration, corrosion exposure, and the electrical demands of modern onboard systems.

AMP

Match Output and Voltage

Confirm amperage and voltage before replacing an alternator. Common marine systems use 12 volt charging, but output ratings vary by engine and battery bank.

FIT

Check Mounting and Pulley Style

Alternators can differ by case size, mounting ears, pulley diameter, belt type, serpentine setup, wiring plug, and rotation requirements.

CHG

Inspect the Full Charging System

Belts, pulleys, regulators, wiring, grounds, and batteries all affect charging performance. A failed part can point to a larger system issue.

Parts Desk Guidance

Alternator Assembly or Related Component?

If the alternator has failed mechanically or electrically, a complete replacement may be needed. If the issue is output control, belt alignment, noise, or mounting, a regulator, pulley, bracket, belt, or accessory part may solve the repair.

Choose an alternator For failed charging output, worn bearings, damaged housings, or a direct OEM replacement by part number.
Choose a high-output alternator When the boat has larger battery banks, added electronics, refrigeration, inverter loads, or upgraded charging needs.
Choose a voltage regulator When output control or charging behavior is the issue and the alternator itself is still serviceable.
Choose pulleys, brackets, or hardware For belt alignment, mounting repairs, serpentine conversions, or charging-system installation work.

Common Questions

Marine Alternator Buying Help

How do I find the correct marine alternator?

Start with the OEM part number, engine serial number, engine model, alternator label, mounting pattern, pulley style, voltage, and amperage rating. Exact part-number confirmation is the safest path.

Can I replace a marine alternator with an automotive alternator?

No. Marine alternators are designed for the engine-room environment and must meet ignition-protection and corrosion-resistance expectations for marine use. Use a marine-grade replacement.

When should I consider a high-output alternator?

Consider high-output charging when your boat has larger battery banks, heavy electronics, inverter loads, refrigeration, or frequent low-speed charging needs that exceed the original alternator's capability.

What else should I inspect when replacing an alternator?

Inspect belts, pulleys, brackets, wiring, grounds, battery condition, fuses, and regulators. Charging problems can come from more than the alternator itself.

Ready to Find Your Part?

Search Marine Alternators, Regulators & Charging Parts

Use the collection page or search by brand, part number, amperage, voltage, pulley type, or charging-system component.

Shop All Alternators Volvo Penta Yanmar Sierra

Filters

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Quicksilver - 70 Amp Alternator Delco Serpentine - 862031T1

$0.00 - $0.00
$0.00
$509.41
$509.41 - $509.41
$509.41
In stock

The Mercury MerCruiser Quicksilver 862031T1 is a 70 amp marine alternator for select GM-based V6 and V8 MerCruiser sterndrive and inboard engines. ...

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$0.00 - $0.00
$0.00
$509.41
$509.41 - $509.41
$509.41
Balmar APM24 Alternator Protection Module, 24V

Balmar APM24 Alternator Protection Module, 24V

$149.29 - $149.29
$149.29
$149.29 - $149.29
$149.29
In stock

The Balmar APM provides best-in-class surge protection using the latest technology developed for the automotive industry. It can protect alternator...

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$149.29 - $149.29
$149.29
$149.29 - $149.29
$149.29
OMC Cobra Alternator

OMC Cobra Alternator

$442.99 - $442.99
$442.99
$442.99 - $442.99
$442.99
In stock

12 volt - 55 ampReplaces: Prestolite/Motorola Internal regulatorNegative groundSingle groove pulley2" mounting foot

$442.99 - $442.99
$442.99
$442.99 - $442.99
$442.99
Inboard Alternator

Inboard Alternator

$427.99 - $427.99
$427.99
$427.99 - $427.99
$427.99
In stock

Fits: MercrusierInternal fan50-mm multi-groove serpentine pulley includedNew

$427.99 - $427.99
$427.99
$427.99 - $427.99
$427.99
Alternator

Alternator

$357.09 - $357.09
$357.09
$357.09 - $357.09
$357.09
In stock

12 volt - 70 amp Self exciting Ignition protection screens internal regulator, negative ground and single groove pulley

$357.09 - $357.09
$357.09
$357.09 - $357.09
$357.09
Arco 60073 Volvo Penta Alternator

Arco 60073 Volvo Penta Alternator

$434.49 - $434.49
$434.49
$434.49 - $434.49
$434.49
In stock

Fits: Late model Volvo Penta, 12 Volt, 75 Amp, 50-mm multi-groove. Serpentine pulley included. Replaces: VOLVO 3862665, 3884950, SIERRA 18-5882, 18...

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$434.49 - $434.49
$434.49
$434.49 - $434.49
$434.49
Alternator

Alternator

$359.69 - $359.69
$359.69
$359.69 - $359.69
$359.69
In stock

12 volt - 70 amp Self exciting Ignition protection screens internal regulator, negative ground and single groove pulley

$359.69 - $359.69
$359.69
$359.69 - $359.69
$359.69
Arco 60072 Volvo Penta Alternator

Arco 60072 Volvo Penta Alternator

$459.99 - $459.99
$459.99
$459.99 - $459.99
$459.99
In stock

Fits: Late model Volvo Penta, 12 Volt, 65 Amp, Multi-groove serpentine pulley included.Replaces: VOLVO 3860082, SIERRA 18-5979

$459.99 - $459.99
$459.99
$459.99 - $459.99
$459.99
Arco 60070 Volvo Penta Alternator

Arco 60070 Volvo Penta Alternator

$483.59 - $483.59
$483.59
$483.59 - $483.59
$483.59
In stock

3856600 & 3860171 12 volt - 65 amp Internal Regulator 2-inch mounting foot Single groove pulley included

$483.59 - $483.59
$483.59
$483.59 - $483.59
$483.59
Mercruiser Alternator

Mercruiser Alternator

$431.39 - $431.39
$431.39
$431.39 - $431.39
$431.39
In stock

12 volt, 65 amp Mercruiser 805447T Internal regulator 2-inch mounting foot Single groove pulley included

$431.39 - $431.39
$431.39
$431.39 - $431.39
$431.39
Mercruiser Alternator

Mercruiser Alternator

$447.99 - $447.99
$447.99
$447.99 - $447.99
$447.99
In stock

Mercruiser 807653T 12 volt - 65 amp Internal regulator 2-inch mounting foot Multi-groove serpentine pulley included

$447.99 - $447.99
$447.99
$447.99 - $447.99
$447.99
Mercruiser Alternator

Mercruiser Alternator

$423.99 - $423.99
$423.99
$423.99 - $423.99
$423.99
In stock

12 volt - 55 amp Mercruiser 807652T Internal regulator 2-inch mounting foot Multi-groove serpentine pulley included

$423.99 - $423.99
$423.99
$423.99 - $423.99
$423.99
Mercruiser O.E.M. Alternator

Mercruiser O.E.M. Alternator

$393.29 - $393.29
$393.29
$393.29 - $393.29
$393.29
In stock

Replaces: Mercruiser 817119A1 12 volt - 55 amp Internal regulator Single groove pulley 2" mounting foot

$393.29 - $393.29
$393.29
$393.29 - $393.29
$393.29
Alternator

Alternator

$566.49 - $566.49
$566.49
$566.49 - $566.49
$566.49
In stock

See Sierra's catalog for current application information.

$566.49 - $566.49
$566.49
$566.49 - $566.49
$566.49
Battswitch w/Alternator Disconnect

Battswitch w/Alternator Disconnect

$132.09 - $132.09
$132.09
$132.09 - $132.09
$132.09
In stock

Medium Duty. For use with two or more batteries and single or dual engine systems. Permits selection between batteries for starting and charging or...

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$132.09 - $132.09
$132.09
$132.09 - $132.09
$132.09
Switch Battery Heavy Duty On-Off

Switch Battery Heavy Duty On-Off

$194.88 - $194.88
$194.88
$194.88 - $194.88
$194.88
In stock

Up to 600A continuous rating for large diesel engines. One-piece tin-plated copper stud design never loosens over time. Terminal studs accept 1/2" ...

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$194.88 - $194.88
$194.88
$194.88 - $194.88
$194.88
Attwood Battery Selector Switch 4 Way

Attwood Battery Selector Switch 4 Way

$71.99 - $71.99
$71.99
$71.99 - $71.99
$71.99
In stock

Single-pole, triple-throw switch permits four connection modes: Battery One, Battery Two, two batteries in parallel, or both off. Rated for 300-amp...

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$71.99 - $71.99
$71.99
$71.99 - $71.99
$71.99

ProMariner - Pro IsoCharge 3-Bank - 23125

$0.00 - $0.00
$0.00
$636.99
$636.99 - $636.99
$636.99
In stock

The ProMariner ProIsoCharge 180-3 is an advanced digital battery isolator for 12V marine charging systems with one alternator input and three indep...

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$0.00 - $0.00
$0.00
$636.99
$636.99 - $636.99
$636.99
ProMariner Pro Isocharge, 2 Bank

ProMariner Pro Isocharge, 2 Bank

$273.92 - $273.92
$273.92
$273.92 - $273.92
$273.92
In stock

Pro IsoCharge delivers digitally controlled alternator output distribution while protecting the health of engine start batteries. Eliminate typical...

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$273.92 - $273.92
$273.92
$273.92 - $273.92
$273.92
Seachoice 11294 300 Amp Marine Rated Battery Fuse

Seachoice 11294 300 Amp Marine Rated Battery Fuse

$30.01 - $30.01
$30.01
$30.01 - $30.01
$30.01
In stock

These marine rated fuses are suitable for main and auxiliary circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

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$30.01 - $30.01
$30.01
$30.01 - $30.01
$30.01
Seachoice 11293 250 Amp Marine Rated Battery Fuse

Seachoice 11293 250 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
In stock

These marine rated fuses are suitable for main and auxiliary circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

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$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Seachoice 11287 100 Amp Marine Rated Battery Fuse

Seachoice 11287 100 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
In stock

These marine rated fuses are suitable for main and auxiliary circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

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$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Seachoice 11286 80 Amp Marine Rated Battery Fuse

Seachoice 11286 80 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
In stock

These marine rated fuses are suitable for main and auxiliary Circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

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$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Seachoice 11284 60 Amp Marine Rated Battery Fuse

Seachoice 11284 60 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
In stock

These marine rated fuses are suitable for main and auxiliary circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

View full details
$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31