Cummins Diesel Marine Alternator 12V 105A | Replaces 3934778, 8099N, WA-8099N

Ensure dependable, high-output electrical charging for your marine or industrial engine setup with this brand-new, premium aftermarket replacement alternator. Engineered specifically to handle the demands of heavy-duty marine operation and high-vibration conditions, this 12-volt, 105-amp unit provides robust charging performance to sustain both starting banks and deep-cycle house batteries.

This unit is built around the heavy-duty 19SI frame design and features a standard internal regulator setup with an external fan configuration (IR/EF). It features a clockwise rotation layout and is shipped without a pulley, allowing you to easily transfer your existing factory pulley to ensure perfect belt alignment.

Technical Specifications

• Voltage: 12 Volts
• Amperage: 105 Amps
• Rotation: Clockwise (CW)
• Frame Style: Delco 19SI Series
• Design Layout: Internal Regulator / External Fan (IR/EF)
• Pulley: Not Included (Directly accepts your existing factory pulley)
• Shaft Size: 22mm

Cross-Reference & Part Numbers

This unit cleanly interchanges with the following original equipment manufacturer (OEM) and aftermarket reference part numbers:

• Cummins: 3934778, 3675256RX, 5282840, 3934777
• Delco Remy: 19009957, 10459316, 19009956, 19009958, 19009959
• Lester Reference: 8099, 8099N
• WAI / Aftermarket: WA-8099N, 8099N-USA, ADR0238

Engine & Equipment Compatibility

This versatile 19SI alternator layout fits an extensive variety of marine propulsion systems, agricultural machinery, and heavy industrial engines. Common matching applications include:

Cummins Marine Diesel Engines

• Cummins 330B Marine
• Cummins 370B Marine
• Cummins QSB 5.9 Series (Early models)
• Cummins 4BT (3.9L) & 6BT / 6C Series industrial configurations

Agricultural & Windrower Applications

• MacDon Windrowers: Fits various heavy platforms utilising the Delco 19SI system.
• Westward Equipment: Windrower Models 9250, 9350, 9352.
• Willmar Sprayers: Eagle 8100 Series engines.
• Apache Sprayers: Select equipment lines matching OEM block references.