High-Capacity Alternator for Demanding Marine and RV Electrical Systems

Built to deliver exceptional charging performance, this 12V high-output alternator is engineered for marine, RV, commercial and specialty vehicle applications with substantial onboard electrical demands. The large-frame design provides up to 275A nominal output while maintaining strong charging performance at idle and cruising speeds. Featuring a 3.15" saddle mount, externally regulated operation, isolated ground configuration and a 49mm K6 serpentine pulley, it is well suited to advanced battery systems, including lithium installations when paired with a compatible external regulator.

Key Features

• 275A High Output Capacity – Delivers substantial charging current to support large battery banks, inverters and high-power onboard electrical equipment.
• Externally Regulated Operation – Designed for use with an external voltage regulator, providing precise charging control for AGM, GEL and lithium battery systems.
• Large 138mm Frame Design – Large-frame construction offers increased cooling capacity and sustained charging performance under continuous operation.
• 3.15" Saddle Mount Housing – Suitable for many applications using the 3.15" saddle mounting configuration, including numerous Yanmar engine installations.
• Isolated Ground Configuration – Electrically isolated ground design supports installations requiring independent grounding and improved system compatibility.
• 49mm K6 Serpentine Pulley – Supplied with a 6-groove serpentine pulley for efficient belt drive and reliable power transfer.
• Excellent Low-Speed Charging Performance – Maintains strong charging output at idle, helping replenish batteries even during low engine speeds.
• Enhanced Cooling Design – Heat-dissipating coatings, dual cooling fans and an externally mounted rectifier assist in maintaining lower operating temperatures.
• Ignition Protected – SAE J1171 certified for use in marine engine compartments where ignition protection is required.

Engineered for continuous heavy-duty charging, this alternator provides reliable performance for vessels and vehicles with demanding electrical systems while supporting modern externally regulated charging solutions.