Part Number: 725038
Indmar 725038 Alternator Belt
Keep your charging system working the way it should with the Indmar 725038 Alternator Belt. This OEM V-belt is designed for Indmar inboard engines that use a traditional pulley setup, delivering the correct fit and grip needed to keep the alternator turning consistently.
Over time, belts can stretch, crack, or glaze—leading to slipping, noise, and reduced charging performance. Replacing it with the proper factory-spec belt helps restore steady voltage output and prevents unexpected issues on the water. The 725038 is built for marine conditions, with durable materials that stand up to heat, moisture, and constant vibration inside the engine compartment.
Engineered to match original length and profile, this belt installs easily and maintains proper alignment on compatible engines, making it a simple but important maintenance item.
Common Engine & Boat Fitments
The 725038 alternator belt is typically used on Indmar engines with V-belt drive systems, commonly found on GM-based 5.0L and 5.7L platforms from the late 1990s through early 2000s.
Typical applications include:
- Supra Sunsport, Supra Comp, and Supra Launch (Indmar-powered models)
- Moomba Outback, Moomba Mobius, and Moomba Outback LS
- Malibu Sunsetter and Malibu Response with Indmar engines
- MasterCraft ProStar 190 and MasterCraft Maristar (Indmar-equipped)
These boats rely on belt-driven accessory systems, making proper belt condition essential for maintaining consistent charging and engine performance.
Fitment can vary depending on pulley configuration and model year, so confirming compatibility with part number 725038 is recommended before ordering.
Key Features
- Genuine Indmar OEM V-belt
- Designed for reliable alternator drive performance
- Helps maintain consistent battery charging
- Durable construction for marine environments
- Direct replacement for easy installation
If your belt is showing signs of wear or slipping under load, replacing it is one of the easiest ways to avoid charging issues and downtime. The Indmar 725038 alternator belt provides the fit and reliability your engine depends on.