Part Number: 575021
Keep your boat’s electrical system running strong with the Indmar 575021 170 Amp Alternator—a high-output OEM solution designed for modern Indmar inboard engines. Built for boats that demand more than a standard charging system, this alternator delivers consistent power for ballast pumps, audio systems, lighting, and other onboard accessories without sacrificing reliability.
With a 170-amp output and serpentine pulley configuration, this alternator is engineered for efficient charging and stable voltage under load. It’s commonly used on Indmar engines equipped with external excitation systems, making it a dependable choice for newer towboats with increased electrical requirements.
Built with marine-grade components, it’s designed to handle heat, vibration, and moisture in real-world conditions. The higher output supports faster battery recovery and helps maintain system performance even when multiple accessories are running at once.
The 575021 alternator is typically found on Indmar-powered boats with upgraded or mid-to-high output charging systems. Known fitments include:
- Supra SA, Supra SE, Supra SL, and Supra SG with Indmar Raptor engines
- Moomba Mojo, Moomba Max, Moomba Craz, and Moomba Mondo with Indmar power
- Malibu Wakesetter 23 LSV and Malibu Wakesetter 25 LSV (Indmar-equipped years)
- Axis A22 and Axis A24
- Select MasterCraft XStar models with Indmar engines
Fitment can vary by engine package and model year, so confirming compatibility by part number (575021) or engine specifications is recommended before ordering.
Key Features:
- 170 amp high-output performance for increased electrical demand
- OEM Indmar design for proper fit and dependable operation
- Serpentine pulley configuration for modern engine setups
- Supports ballast systems, premium audio, lighting, and accessories
- Built for durability in marine environments
If your boat runs multiple accessories or upgraded electronics, the Indmar 575021 provides the output and reliability needed to keep everything powered and performing the way it should.