Part Number: 725904
Indmar 725904 Alternator Belt
Keep your charging system dependable with the Indmar 725904 Alternator Belt. This OEM serpentine belt is designed to match the original specifications of Indmar inboard engines, providing the correct length, rib profile, and tension needed for smooth accessory operation.
A worn or stretched belt can lead to slipping, noise, and reduced charging performance. Replacing it with the proper factory-fit belt helps restore consistent alternator output and keeps critical systems running the way they should. Built for marine conditions, the 725904 is designed to handle heat, moisture, and constant vibration without premature wear.
As a direct replacement, this belt installs easily and maintains proper alignment on compatible serpentine drive systems—helping reduce downtime and prevent unexpected issues on the water.
Common Engine & Boat Fitments
The 725904 alternator belt is used on select Indmar engines with serpentine drive systems, commonly found on newer GM-based platforms and performance-oriented applications.
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 22 LSV, 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 accessories, making proper belt performance essential for maintaining consistent charging.
Fitment can vary based on engine configuration, pulley setup, and model year, so confirming compatibility with part number 725904 is recommended before ordering.
Key Features
- Genuine Indmar OEM serpentine belt
- Designed for reliable alternator and accessory drive operation
- Helps maintain proper battery charging and system performance
- Durable construction for marine environments
- Direct-fit replacement for quick installation
If your belt is worn, cracked, or slipping under load, replacing it is a simple way to prevent charging issues and keep your boat running smoothly. The Indmar 725904 alternator belt delivers the fit and reliability your engine was designed for.