This is a heavy-duty 24V 175A marine alternator designed as a direct replacement for Volvo Penta diesel engines and various industrial applications from the 1960s to 2001. Built to Motorola (Prestolite) specifications with an external fan and internal regulator, it delivers high-output charging for demanding marine and agricultural/industrial electrical systems. Technical Specifications: Product Type: Alternator Application: Ag/Industrial, Marine OE Manufacturer: Motorola (Prestolite) Voltage: 24V Amperage: 175A Regulator: Internal Fan Type: External Pulley: Not Included Polarity: Negative - or Positive + Weight: 12.7 kg (28 lb) Fitment Includes: Volvo Penta Marine Diesel Engines: TAMD162A/B/C 16.1L (1988-2001) TAMD120A/B 12.0L (1972-1983) TMD120A/B 12.0L (1970-1984) TMD100A/B/C 9.6L (1965-1988) Also Fits: Various Caterpillar, Cummins, and other industrial engines (see OE list). Installation Tips: CRITICAL: Confirm your system operates on 24 Volts. This alternator is not for 12V systems. Pulley is sold separately. You must reuse your existing pulley or purchase a compatible one. Note the polarity can be configured as negative or positive ground. Set according to your vessel's electrical system. Due to its substantial weight (28 lbs), ensure mounting brackets are secure during installation.