Your vehicle alternator needs to have a high starting power so that your engine does not stall. A dying alternator may lead to other electrical issues in your car. The alternator supplies energy to all electrical systems in a vehicle. A failing/failed alternator's symptoms may include dimming lights. It is important because it helps to power your vehicle when you travel. Key Features: Engineered for performance and reliability. Engineered and manufactured with precision and quality. Meet and exceed OEM performance. Replaces OMC 3857561 Specifications: Brand: ARCO Marine SKU: 60070 UPC: 693006001296 Weight: 12.00 LBS This product fits Late model Volvo Penta, 12 Volt, 65 Amp, Internal Regulator 2-inch mounting foot, Single groove pulley included. ARCO NEW OEM Premium Replacement Alternator Replaces OMC 3857561 Warranty: ARCO product to be defective under proper installation and utilization conditions, we are obligated to replace or repair the product or issue a refund of the purchase price. 12 volt. 65 amp. Internal regulator. 2-inch mounting foot. Single groove pulley included. Fits: Late model Volvo Penta. Replaces: Mando