Used-Good Sierra marine alternator that fits Yanmar 3JH3 3-cylinder diesel engines from approximately 1999–2003. Compatible with Sierra part numbers 18-6278, 18-6297, and 18-6929. Alternator is Condition A with clean housing, intact mounting points, and solid electrical terminals. Item has been previously opened and handled but remains in Used-Good condition and functions as intended. Suitable replacement for Yanmar marine diesel applications.