Part Number: 725905
Indmar 725905 Alternator Belt
Keep your charging system reliable with the Indmar 725905 Alternator Belt. This OEM serpentine belt is designed to match factory specifications, providing the correct length, rib profile, and grip needed to drive the alternator and engine accessories without slip or noise.
As belts age, they can stretch, crack, or lose tension—leading to poor battery charging and inconsistent system voltage. Replacing it with the proper factory-fit belt helps restore smooth operation and keeps your electrical system performing as intended. Built for marine conditions, the 725905 is designed to handle heat, moisture, and constant vibration inside the engine compartment.
Engineered as a direct replacement, this belt installs easily and maintains proper alignment on compatible serpentine systems, helping reduce maintenance time and prevent unexpected issues on the water.
Common Engine & Boat Fitments
The 725905 alternator belt is used on select Indmar engines with serpentine drive systems, commonly found on newer GM-based platforms such as 5.7L, 6.0L, and 6.2L configurations.
Typical applications include:
- Supra SA, Supra SE, Supra SL, and Supra SG (Indmar-powered models)
- Moomba Mojo, Moomba Max, Moomba Craz, and Moomba Mondo
- Malibu Wakesetter 23 LSV and 25 LSV with Indmar engines
- Axis A22 and Axis A24
- MasterCraft XStar and select X-Series models with Indmar engines
These boats often operate with higher electrical demand from ballast systems, audio upgrades, and onboard electronics, making proper belt performance essential for consistent charging.
Fitment can vary depending on engine configuration and model year, so confirming compatibility with part number 725905 is recommended before ordering.
Key Features
- Genuine Indmar OEM serpentine belt
- Designed for reliable alternator and accessory drive operation
- Helps maintain consistent charging system performance
- Durable construction for marine environments
- Direct-fit replacement for easy installation
If your belt is showing signs of wear or slipping under load, replacing it is a simple way to prevent charging issues and keep your boat running smoothly. The Indmar 725905 alternator belt delivers the fit and reliability your engine was designed for.