Engine Parts & Service - Alternators
Marine engine alternators are essential for generating reliable charging power and keeping your vessel's electrical system operating at peak performance. Engineered for demanding freshwater and saltwater environments, these marine-grade alternators feature corrosion-resistant construction, durable internal components, and dependable charging output designed to withstand vibration, heat, and harsh marine conditions. From OEM replacement alternators and high-output charging systems to alternator regulators, pulleys, mounting hardware, and service components, these products help maintain consistent power for starting batteries, house battery banks, navigation electronics, lighting, pumps, and other onboard equipment. High-quality marine alternators improve charging efficiency, support modern battery technologies, and help reduce the risk of power loss while underway.
Featuring premium products from trusted brands such as ARCO Marine, Balmar, and other leading manufacturers, our Engine Parts & Service – Alternators collection delivers the quality, durability, and performance serious boaters expect. Browse our selection today and let our knowledgeable team help you choose the ideal alternator or charging component for your vessel's engine.
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Vendor:Balmar
Balmar Alternator 250 AMP Kit 12V 3.15" Dual Foot Saddle J10 Pulley Regulator Temp Sensor [XT-DF-250-J10-KIT]
- £1,101.57
£1,310.96- £1,101.57
- Unit price
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Alternator 250 AMP Kit 12V 3.15" Dual Foot Saddle J10 Pulley Regulator & Temp SensorKit Includes: XT-DF-250-J10 Alternator, MC-618 Regulator, Temperature Sensors & Mounting HardwareXT Series Alternator: 250A, 12V, Saddle Mount (Dual Foot), 3.15in, J10 AltMount Serpentine Pulley, Case GroundHitachi-Style Mounting; Typical for Yanmar,...- £1,101.57
£1,310.96- £1,101.57
- Unit price
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Vendor:Balmar
Balmar 60 Series Alternator - Saddle Mount(Dual Foot) - 100A - 12V [60-100-SV]
- £522.54
£622.07- £522.54
- Unit price
- / per
60 Series Alternator - Saddle Mount(Dual Foot) - 100A - 12VFeatures: 100A 12V Saddle Mount (Dual Foot) 3.15" Single Deep Vee Pulley Isolated Ground Hitachi-Style Mounting; Typical for Yanmar, Westerbeke, Lehman & Perkins-Sabre Engines This product may not be returned to the original point...- £522.54
£622.07- £522.54
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Vendor:Balmar
Balmar Alternator 120 AMP 12V 4" Dual Foot Saddle K6 Pulley w/Isolated Ground [604-120-K6]
- £564.90
£672.46- £564.90
- Unit price
- / per
Alternator 120 AMP 12V 4" Dual Foot Saddle K6 Pulley with Isolated GroundAlternator, 604 Series, 120A, 12V, Saddle Mount (Dual Foot), 4in, K6 Serpentine Pulley, Isolated Ground 4" J-180-Style Mounting; Typical for Caterpillar, Cummins, Detroit Diesel & John Deere EnginesReplaces: 604-120-SR-IGThis product may not...- £564.90
£672.46- £564.90
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Vendor:ARCO Marine
ARCO Marine Premium Replacement Inboard Alternator w/Single Groove Pulley - 12V 55A [60125]
- £178.39
£231.38- £178.39
- Unit price
- / per
Premium Replacement Inboard Alternator with Single Groove Pulley - 12V 55AReplacement alternator that will fit O.M.C. Cobra., Prestolite/Motorola, 12 Volt, 55 Amp, Internal regulator, Negative ground, 2-inch mounting foot, Single groove pulley included.Features: All alternators are engineered for performance and reliability All alternators are...- £178.39
£231.38- £178.39
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Vendor:Balmar
Balmar Belt Buddy w/Universal Offset Adjustment Arm (UAA2) [UBB2]
- £72.09
£81.98- £72.09
- Unit price
- / per
Belt Buddy with Universal Offset Adjustment Arm (UAA2)Belt Buddy Kit; Includes the Universal Adjustment Arm (UAA2) with a 1/2" offset for mounting applications which require an offset to the alternator and Belt Buddy Mechanism (BB).To utilize only the adjustment mechanism with an existing adjustment...- £72.09
£81.98- £72.09
- Unit price
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Vendor:Balmar
Balmar Universal Adjustment Arm - Offset [UAA2]
- £42.36
£48.38- £42.36
- Unit price
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Universal Adjustment Arm - OffsetUniversal Adjustment Arm for the Belt Buddy with a 1/2″ offset for certain mounting applications which require an offset. This part number is for the “Arm Only”, It does not come with the Belt Buddy Adjustment Mechanism.The Belt Buddy Mechanism...- £42.36
£48.38- £42.36
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Vendor:ARCO Marine
ARCO Marine Zeus A225S J-180 3.15" Alternator w/Terminal Block [4010]
- £570.71
£650.02- £570.71
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Zeus A225S J-180 3.15" Alternator with Terminal BlockThe highest power output alternator in its size/class. Features: Engineered for High Energy Production. Suitable for Marine, RV, Military, and Commercial applications. Rapidly charges large battery banks. Coolest operating temperatures for increased performance. Runs 8 - 20% cooler...- £570.71
£650.02- £570.71
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Vendor:ARCO Marine
ARCO Marine Replacement Alternator f/Mercury Engines - 75-115 HP [20852]
- £196.97
£284.95- £196.97
- Unit price
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Replacement Alternator for Mercury Engines - 75-115 HPReplacement alternator that will fit Mercury Outboard Engines 75 HP - 115 HP, 12 Volt, 50 AMP, internal fan, 4 grooves, pulley included. Features: All alternators are engineered for performance and reliability. All alternators are engineered and manufactured...- £196.97
£284.95- £196.97
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Vendor:ARCO Marine
ARCO Marine Zeus A275L Transit Alternator w/Terminal Block [4032]
- £733.42
£835.62- £733.42
- Unit price
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Zeus A275L Transit Alternator with Terminal BlockHigh Output / High Amperage Alternator: The Highest Power Output in Its Class.Features: Replace your noisy generator! Engineered for high energy production. Suitable for marine, RV, military, and commercial applications. Rapidly charges large battery banks. Coolest operating temperatures...- £733.42
£835.62- £733.42
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Vendor:Balmar
Balmar Pulley Kit f/Perkins 4170, 4108 (K6) [48-PSP-410-A]
- £636.26
£0.00- £636.26
- Unit price
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Pulley Kit for Perkins 4170, 4108 (K6)AltMount®Serpentine Pulley Conversion Kit for Perkins/Sabre EnginesPerkins/Sabre Engines Covered: 4107, 4108Kit Includes: Three Six-Groove (K6) Pulleys, Two K6, 40″ Circumference Serpentine Belts (one spare) & Mounting HardwareNote: If you specify an AT-200A Alternator, a longer belt length may...- £636.26
£0.00- £636.26
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Vendor:ARCO Marine
ARCO Marine Zeus A8000-48V 8kW J180 4" Alternator w/Isolated Ground [4603]
- £1,593.57
£1,879.75- £1,593.57
- Unit price
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Zeus A8000-48V 8kW J180 4" Alternator with Isolated GroundThe ARCO Zeus A8000-48V alternator turns on at lower RPMs, runs cooler, and provides more power than other 48V alternators that are larger and heavier. This alternator continuously generates over 3kW (55 Amps)at 2,500 RPM and...- £1,593.57
£1,879.75- £1,593.57
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Vendor:Balmar
Balmar Pulley Kit f/Yanmar 6LY, 6LYA-STP, 6LY2-STP [48-YSP-6LY-A]
- £636.26
£0.00- £636.26
- Unit price
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Pulley Kit for Yanmar 6LY, 6LYA-STP, 6LY2-STPAltMount® Serpentine Pulley Conversion Kit for Yanmar Diesel EnginesYanmar Engines Covered: 6LY, 6LYA-STP, 6LY2-STPKit Includes: Three Ten-Groove (J10) Pulleys, Two J10, 55″ Circumference Serpentine Belts (one spare) & Mounting HardwareNote: If you specify an AT-200A Alternator, a longer...- £636.26
£0.00- £636.26
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Vendor:Balmar
Balmar 95 Series Alternator Pully, Altmount [48-AM-39]
- £83.99
£96.40- £83.99
- Unit price
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95 Series Alternator Pully, Altmount®AltMount® Serpentine PulleyTen-Groove (J10) Serpentine Pulley for 95-Series Alternators2.7″ Diameter, 0.875″ BoreThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.- £83.99
£96.40- £83.99
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Vendor:Balmar
Barlmar Pulley Kit f/Yanmar 4LH-A [48-YSP-4LH-A]
- £512.50
£0.00- £512.50
- Unit price
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Pulley Kit for Yanmar 4LH-AAltMount®Serpentine Pulley Conversion Kit for Yanmar Diesel EnginesYanmar Engines Covered: 4LH-AKit Includes: Three Ten-Groove (J10) Pulleys, Two J10, 47″ Circumference Serpentine Belts (one spare) & Mounting HardwareNote: If you specify an AT-200A Alternator, a longer belt length may be required.This...- £512.50
£0.00- £512.50
- Unit price
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Vendor:Balmar
Balmar Lehman Serp Pulley Kit [48-FSP-100]
- £636.26
£0.00- £636.26
- Unit price
- / per
Lehman Serp Pulley KitAltMount®Serpentine Pulley Conversion Kit for Ford/Lehman EnginesFord/Lehman Engines Covered: FL80, FL120Kit Includes: Three Ten-Groove (J10) Pulleys, Two J10, 55" Circumference Serpentine Belts (one spare)Note: If you specify an AT-200A Alternator, a longer belt length may be required. This product may not be...- £636.26
£0.00- £636.26
- Unit price
- / per
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Vendor:ARCO Marine
ARCO Marine Zeus A275L N62 Alternator w/Clutch Pulley Regulator [A275L-12-N62-IE-50K6CP]
- £581.26
£886.02- £581.26
- Unit price
- / per
Zeus A275L N62 Alternator with Clutch Pulley & RegulatorThe highest power output alternator in its size/class. Features: Engineered for High Energy Production. Suitable for Marine, RV, Military, and Commercial applications. Rapidly charges large battery banks. Coolest operating temperatures for increased performance. Runs 8 - 20%...- £581.26
£886.02- £581.26
- Unit price
- / per
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Vendor:ARCO Marine
ARCO Marine Zeus A275L Transit Alternator w/Regulator [A275L-12-TR-IE-49K6]
- £581.26
£844.40- £581.26
- Unit price
- / per
Zeus A275L Transit Alternator with RegulatorThe highest power output alternator in its size/class. Features: Engineered for High Energy Production. Suitable for Marine, RV, Military, and Commercial applications. Rapidly charges large battery banks. Coolest operating temperatures for increased performance. Runs 8 - 20% cooler than incumbent...- £581.26
£844.40- £581.26
- Unit price
- / per
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Vendor:ARCO Marine
ARCO Marine Zeus A275L N62 Alternator w/Regulator [A275L-12-N62-IE-49K6]
- £844.40
£0.00- £844.40
- Unit price
- / per
Zeus A275L N62 Alternator with RegulatorThe highest power output alternator in its size/class. Features: Engineered for High Energy Production. Suitable for Marine, RV, Military, and Commercial applications. Rapidly charges large battery banks. Coolest operating temperatures for increased performance. Runs 8 - 20% cooler than incumbent...- £844.40
£0.00- £844.40
- Unit price
- / per
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Vendor:ARCO Marine
ARCO Marine Zeus A275L N62 Alternator w/Terminal Block [A275L-12-N62-EX-49K6]
- £759.66
£0.00- £759.66
- Unit price
- / per
Zeus A275L N62 Alternator with Terminal BlockThe highest power output alternator in its size/class. Features: Engineered for High Energy Production. Suitable for Marine, RV, Military, and Commercial applications. Rapidly charges large battery banks. Coolest operating temperatures for increased performance. Runs 8 - 20% cooler than...- £759.66
£0.00- £759.66
- Unit price
- / per
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Vendor:Balmar
Balmar Offshore Repair Kit AT Series 200AMP 12V Includes Bearings, Brushes, Rectifier [70-AT-200]
- £150.15
£167.99- £150.15
- Unit price
- / per
Offshore Repair Kit AT Series 200AMP 12V Includes Bearings, Brushes, RectifierOffshore Repair Kit, AT Series Alternators, 12V, 200AIncludes: Bearings, Brushes, RectifierThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.- £150.15
£167.99- £150.15
- Unit price
- / per


![ARCO Marine Premium Replacement Inboard Alternator w/Single Groove Pulley - 12V 55A [60125]](http://www.dbmarinesupplies.com/cdn/shop/files/97203XL_533x.jpg?v=1682828536)
![ARCO Marine Zeus A275L Transit Alternator w/Terminal Block [4032]](http://www.dbmarinesupplies.com/cdn/shop/files/108403XL_533x.jpg?v=1744330787)
![ARCO Marine Zeus A8000-48V 8kW J180 4" Alternator w/Isolated Ground [4603]](http://www.dbmarinesupplies.com/cdn/shop/files/108031XL_533x.jpg?v=1741301988)
![ARCO Marine Zeus A275L N62 Alternator w/Clutch Pulley Regulator [A275L-12-N62-IE-50K6CP]](http://www.dbmarinesupplies.com/cdn/shop/files/103953XL_533x.jpg?v=1715729346)
![ARCO Marine Zeus A275L Transit Alternator w/Regulator [A275L-12-TR-IE-49K6]](http://www.dbmarinesupplies.com/cdn/shop/files/103951XL_533x.jpg?v=1715729323)
![ARCO Marine Zeus A275L N62 Alternator w/Regulator [A275L-12-N62-IE-49K6]](http://www.dbmarinesupplies.com/cdn/shop/files/103947XL_533x.jpg?v=1715729278)
![ARCO Marine Zeus A275L N62 Alternator w/Terminal Block [A275L-12-N62-EX-49K6]](http://www.dbmarinesupplies.com/cdn/shop/files/103946XL_533x.jpg?v=1715729267)