Having a good-quality and heavy-duty alternator for your boat is very important. If your battery often fails, overheats, and has a bad smell coming from the alternator, it might be a bad indicator that there is something to be fixed to prevent damages to your boat soon. You don't have to worry anymore! We have the Alternator - ARCO Marine (60125) for you. It is an alternator that is engineered for performance and reliability. It has a 55 amp 12-volt marine alternator with 2 inches mounting foot and a single v-groove pulley that is manufactured with precision and quality. The Alternator - ARCO Marine (60125) also has an internal regulator and negative ground, which guarantees the best performance of this alternator. Key Features: It has a 55 amp 12-volt marine alternator 2 inches mounting foot single v-groove pulley It has an internal regulator It has negative ground Replaces Volvo Penta 3860769 Replaces OMC 988247, 985465, 985466, 3857298, and 3860769 Specifications: Brand: ARCO Marine SKU: 60125 UPC: 693006001395 Weight: 12.00 LBS 12 volt. 55 amp. Internal regulator. Negative ground. 2-inch mounting foot. Single groove pulley included. Fits: OMC Cobra. Replaces: Prestolite/Motorola