Part Number: 725903
Indmar 725903 Alternator Belt
Keep your engine’s charging system running smoothly with the Indmar 725903 Alternator Belt. This OEM serpentine belt is designed to deliver the correct fit and dependable grip needed to drive your alternator and accessories without slipping, squealing, or premature wear.
A worn belt can lead to inconsistent voltage, weak battery charging, and reduced accessory performance. Replacing it with the proper factory-spec belt helps restore stable operation and ensures your engine maintains reliable output throughout the day. The 725903 is built for marine conditions, with materials designed to handle heat, moisture, and constant vibration inside the engine compartment.
Engineered to match original length and rib profile, this belt installs easily and maintains proper alignment and tension on compatible Indmar engines.
Common Engine & Boat Fitments
The 725903 alternator belt is used on select Indmar engines with serpentine drive systems, commonly found in 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 (Indmar-equipped configurations)
These boats often run multiple electrical accessories and ballast systems, making proper belt performance critical for maintaining consistent charging.
Fitment can vary based on engine configuration and model year, so confirming compatibility with part number 725903 is recommended before ordering.
Key Features
- Genuine Indmar OEM serpentine belt
- Designed for consistent alternator and accessory drive performance
- Helps maintain proper battery charging and system voltage
- Durable construction for harsh marine environments
- Direct-fit replacement for easy installation
If your current belt is showing signs of wear or slipping under load, replacing it is one of the easiest ways to avoid charging issues on the water. The Indmar 725903 alternator belt delivers the reliability and fit your engine depends on.