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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

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Mitsubishi A3TR0093 Alternator | Volvo Penta 3840181 | 12V 115A

$265.00 - $265.00
$265.00
$265.00 - $265.00
$265.00
Out of stock

Mitsubishi A3TR0093 Alternator — Volvo Penta 3840181 | 12V 115A Part Number A3TR0093 / A003TR0093 Brand Mitsubishi Electric Official P...

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$265.00 - $265.00
$265.00
$265.00 - $265.00
$265.00
Sold out

Mercury Quicksilver OEM Alternator 892940T02 – 70 Amp | Verado FourStroke 135–400 HP

$918.05 - $918.05
$918.05
$918.05 - $918.05
$918.05
Only 1 left!

Mercury Quicksilver OEM Alternator 892940T02 – 70 Amp Part Number: 892940T02  |  Brand: Mercury / Quicksilver  |  GTIN: 745061633070 Genuine Mercu...

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$918.05 - $918.05
$918.05
$918.05 - $918.05
$918.05
Sierra 63474P Sterling Series 3" Stainless Steel Electric Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer & Hourmeter Gauge with Outboard Alternator or Coil Sender Code

Sierra 63474P Sterling Series 3" Stainless Steel Electric Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer & Hourmeter Gauge with Outboard Alternator or Coil Sender Code

$376.99 - $376.99
$376.99
$376.99 - $376.99
$376.99
Item locally warehoused

Overview Sterling Series 3" stainless steel tachometer & hourmeter gauge for marine engines. The 3-inch dial provides 0-7,000 RPM with a dedica...

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$376.99 - $376.99
$376.99
$376.99 - $376.99
$376.99
Sierra 63473P Sterling Series 3" Stainless Steel Electric Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code

Sierra 63473P Sterling Series 3" Stainless Steel Electric Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code

$215.39 - $215.39
$215.39
$215.39 - $215.39
$215.39
Item locally warehoused

Overview Sterling Series 3" Stainless Steel Tachometer Gauge for marine outboard and 4-stroke engines. This 3-inch dial gauge features a brushed al...

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$215.39 - $215.39
$215.39
$215.39 - $215.39
$215.39
Sierra 62561P White Premier Pro Series 3" Stainless Steel Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code

Sierra 62561P White Premier Pro Series 3" Stainless Steel Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code

$257.99 - $257.99
$257.99
$257.99 - $257.99
$257.99
Item locally warehoused

Overview Sierra 62561P White Premier Pro Series 3\" Stainless Steel Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer Gauge with...

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$257.99 - $257.99
$257.99
$257.99 - $257.99
$257.99
Sierra 65693P Lido Series 3" White & Stainless Steel Electric Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code

Sierra 65693P Lido Series 3" White & Stainless Steel Electric Outboard & 4 Stroke Gas Engine 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code

$218.29 - $218.29
$218.29
$218.29 - $218.29
$218.29
Item locally warehoused

Overview A 3-inch tachometer gauge designed for outboard engine instrumentation, featuring a white dial, stainless steel bezel, and 0-7,000 RPM ran...

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$218.29 - $218.29
$218.29
$218.29 - $218.29
$218.29
Sierra 59703P Sahara Series 3" Black & Tan 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code

Sierra 59703P Sahara Series 3" Black & Tan 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code

$215.49 - $215.49
$215.49
$215.49 - $215.49
$215.49
Item locally warehoused

Overview Sierra 59703P Sahara Series 3\" Black & Tan 0-7,000 RPM Dial Range Tachometer Gauge with Outboard Alternator or Coil Sender Code. Blac...

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$215.49 - $215.49
$215.49
$215.49 - $215.49
$215.49
Battswitch w/Alternator Disconnect

Battswitch w/Alternator Disconnect

$132.09 - $132.09
$132.09
$132.09 - $132.09
$132.09
Item locally warehoused

Overview Battswitch w/Alternator Disconnect is a medium-duty battery switch designed for multi-battery configurations in single- or dual-engine sys...

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$132.09 - $132.09
$132.09
$132.09 - $132.09
$132.09
Blue Sea Systems 9002e e-Series 4 Position Selector Battery Switch With Alternator Field Disconnect

Blue Sea Systems 9002e e-Series 4 Position Selector Battery Switch With Alternator Field Disconnect

$128.79 - $128.79
$128.79
$128.79 - $128.79
$128.79
Item locally warehoused

Overview <p>9002e e-Series 4 Position Selector Battery Switch With Alternator Field Disconnect</p><p>High-current battery switch ...

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$128.79 - $128.79
$128.79
$128.79 - $128.79
$128.79
Blue Sea Systems 3002 HD-Series Heavy Duty 4 Position Selector Battery Switch

Blue Sea Systems 3002 HD-Series Heavy Duty 4 Position Selector Battery Switch

$247.19 - $247.19
$247.19
$247.19 - $247.19
$247.19
Item locally warehoused

Overview Blue Sea Systems 3002 HD-Series Heavy Duty 4 Position Selector Battery Switch Key Features 4-Position HD-Series selector battery switch U...

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$247.19 - $247.19
$247.19
$247.19 - $247.19
$247.19
Blue Sea Systems HD-Series Heavy Duty On-Off Battery Switch With AFD

Blue Sea Systems HD-Series Heavy Duty On-Off Battery Switch With AFD

$223.06 - $223.06
$223.06
$223.06 - $223.06
$223.06
Item locally warehoused

Overview HD-Series Heavy Duty On-Off Battery Switch With AFD delivers robust, high-current switching for demanding electrical systems. It features ...

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$223.06 - $223.06
$223.06
$223.06 - $223.06
$223.06
Switch Battery Heavy Duty On-Off

Switch Battery Heavy Duty On-Off

$194.88 - $194.88
$194.88
$194.88 - $194.88
$194.88
Item locally warehoused

Overview Switch Battery Heavy Duty On-Off is a high-current battery switch designed for large diesel engine electrical systems. It features a make-...

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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
Item locally warehoused

Overview Four-way battery selector switch designed to manage multiple DC power sources in marine and other 6–32 V DC electrical systems. It offers ...

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$71.99 - $71.99
$71.99
$71.99 - $71.99
$71.99
ProMariner Pro Isocharge, 2 Bank

ProMariner Pro Isocharge, 2 Bank

$273.92 - $273.92
$273.92
$273.92 - $273.92
$273.92
Item locally warehoused

Overview Pro IsoCharge delivers digitally controlled alternator output distribution while protecting the health of engine start batteries. Key Feat...

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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
Item locally warehoused

Overview These marine-rated fuses provide reliable main and auxiliary circuit protection for demanding marine electrical systems. Rated at 300 A, t...

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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
Item locally warehoused

Overview These marine-rated fuses provide main and auxiliary circuit protection in demanding environments or tight spaces. Key Features 250 Amp ma...

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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
Item locally warehoused

Overview Marine-rated 100 Amp battery fuse designed for main and auxiliary circuit protection in demanding environments and tight spaces. Provides ...

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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
Item locally warehoused

Overview 11286 80 Amp Marine Rated Battery Fuse is designed for main and auxiliary circuit protection in demanding marine environments, including a...

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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
Item locally warehoused

Overview 11284 60 Amp Marine Rated Battery Fuse is designed for main and auxiliary circuit protection in demanding marine environments, including a...

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$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Seachoice 11280 30 Amp Marine Rated Battery Fuse

Seachoice 11280 30 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Item locally warehoused

Overview Seachoice 11280 30 Amp Marine Rated Battery Fuse is designed for main and auxiliary circuit protection in demanding marine environments wh...

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$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Blue Sea Systems 7623 ML Series Automatic Charging Relay, 24V w/Manual Override

Blue Sea Systems 7623 ML Series Automatic Charging Relay, 24V w/Manual Override

$491.22 - $491.22
$491.22
$491.22 - $491.22
$491.22
Item locally warehoused

Overview Blue Sea Systems 7623 ML Series Automatic Charging Relay, 24V w/Manual Override. A dual-battery management relay that automatically ties b...

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$491.22 - $491.22
$491.22
$491.22 - $491.22
$491.22
Blue Sea Systems 7622 ML Series Automatic Charging Relay, 12V w/Manual Override

Blue Sea Systems 7622 ML Series Automatic Charging Relay, 12V w/Manual Override

$597.29 - $597.29
$597.29
$597.29 - $597.29
$597.29
Item locally warehoused

Overview ML Series Automatic Charging Relay (12V) automatically combines batteries during charging and isolates them during discharging and engine ...

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$597.29 - $597.29
$597.29
$597.29 - $597.29
$597.29
ProMariner Battery Isolator

ProMariner Battery Isolator

$435.20 - $435.20
$435.20
$435.20 - $435.20
$435.20
Item locally warehoused

Overview Battery isolator designed to charge multiple battery banks from a single DC source while keeping banks separate. Supports 6, 12, 24 and 32...

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$435.20 - $435.20
$435.20
$435.20 - $435.20
$435.20
Inboard Alternator

Inboard Alternator

$427.99 - $427.99
$427.99
$427.99 - $427.99
$427.99
Item locally warehoused

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

$427.99 - $427.99
$427.99
$427.99 - $427.99
$427.99
Arco 60070 Volvo Penta Alternator

Arco 60070 Volvo Penta Alternator

$483.59 - $483.59
$483.59
$483.59 - $483.59
$483.59
Item locally warehoused

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
Arco 60072 Volvo Penta Alternator

Arco 60072 Volvo Penta Alternator

$459.99 - $459.99
$459.99
$459.99 - $459.99
$459.99
Item locally warehoused

Overview Arco 60072 Volvo Penta Alternator is a 12V, 65A marine alternator designed for late-model Volvo Penta engines, with a multi-groove serpent...

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$459.99 - $459.99
$459.99
$459.99 - $459.99
$459.99
Balmar APM24 Alternator Protection Module, 24V

Balmar APM24 Alternator Protection Module, 24V

$149.29 - $149.29
$149.29
$149.29 - $149.29
$149.29
Item locally warehoused

Overview APM24 Alternator Protection Module, 24V helps safeguard 24V charging systems from damaging voltage spikes. It provides best-in-class surge...

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$149.29 - $149.29
$149.29
$149.29 - $149.29
$149.29
Mercruiser Alternator

Mercruiser Alternator

$447.99 - $447.99
$447.99
$447.99 - $447.99
$447.99
Item locally warehoused

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
OMC Cobra Alternator

OMC Cobra Alternator

$442.99 - $442.99
$442.99
$442.99 - $442.99
$442.99
Item locally warehoused

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
Mercruiser Alternator

Mercruiser Alternator

$423.99 - $423.99
$423.99
$423.99 - $423.99
$423.99
Item locally warehoused

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
Sold out

PCM 70-Amp Marine Alternator | RA097007

$510.14 - $510.14
$510.14
$510.14 - $510.14
$510.14
Out of stock

PCM 70-Amp Marine Alternator – RA097007Keep your batteries charged and your onboard systems powered with a direct-replacement 70-amp alternator bui...

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$510.14 - $510.14
$510.14
$510.14 - $510.14
$510.14
Sold out

Quicksilver - 70 Amp Alternator Delco Serpentine - 862031T1

$509.41 - $509.41
$509.41
$509.41 - $509.41
$509.41
Item locally warehoused

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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$509.41 - $509.41
$509.41
$509.41 - $509.41
$509.41

ProMariner - Pro IsoCharge 3-Bank - 23125

$636.99 - $636.99
$636.99
$636.99 - $636.99
$636.99
Item locally warehoused

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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$636.99 - $636.99
$636.99
$636.99 - $636.99
$636.99

ProMariner - Battery Isolator - 21302

$642.58 - $642.58
$642.58
$642.58 - $642.58
$642.58
Item locally warehoused

The ProMariner 2-130-2 Multi-Battery Isolator is a solid-state DC charging isolator for marine electrical systems with two alternator inputs and tw...

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$642.58 - $642.58
$642.58
$642.58 - $642.58
$642.58

Alternator 75A 12V Serpentine SIE-18-5882

$614.03 - $614.03
$614.03
$614.03 - $614.03
$614.03
Only 2 left!

High-output 75-amp 12-volt alternator with serpentine belt drive for reliable marine electrical charging performance. Part Number: SIE-18-5882 Th...

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$614.03 - $614.03
$614.03
$614.03 - $614.03
$614.03

Sierra Marine Alternator - High-Output Charging System

$614.03 - $614.03
$614.03
$614.03 - $614.03
$614.03
Only 2 left!

Sierra marine alternator engineered for reliable electrical charging system performance. This high-quality alternator ensures consistent power gene...

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$614.03 - $614.03
$614.03
$614.03 - $614.03
$614.03

Volvo Penta Alternator 3840181

$1,365.00 - $1,365.00
$1,365.00
$1,365.00 - $1,365.00
$1,365.00
Only 1 left!

OEM Volvo Penta alternator assembly for reliable electrical charging performance in marine applications. Part Number: 3840181 This genuine Volvo ...

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$1,365.00 - $1,365.00
$1,365.00
$1,365.00 - $1,365.00
$1,365.00

Mercury Alternator 8M0064021 - OEM Marine Charging System

$1,221.74 - $1,221.74
$1,221.74
$1,221.74 - $1,221.74
$1,221.74
Only 1 left!

OEM Mercury alternator assembly for reliable electrical charging performance in marine applications. Part Number: 8M0064021 This genuine Mercury ...

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$1,221.74 - $1,221.74
$1,221.74
$1,221.74 - $1,221.74
$1,221.74

AC Delco Marine Alternator - High-Output Charging System

$261.00 - $261.00
$261.00
$261.00 - $261.00
$261.00
Only 1 left!

AC Delco marine alternator engineered for reliable battery charging and electrical system power in demanding marine environments. This high-output ...

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$261.00 - $261.00
$261.00
$261.00 - $261.00
$261.00