Upgrade your Mercury outboard engine with a high-quality 12V 55A alternator, engineered to provide reliable electrical performance and hassle-free operation on the water. Whether you're replacing a worn-out unit or doing preventative maintenance, this marine-grade alternator is a trusted choice for powering your boat's systems—navigation lights, pumps, radios, and more. Key Features: Voltage: 12V Amperage: 55A Rotation: CW Pulley: 4-Groove Serpentine (64mm OD) Fan/Regulator Type: Internal (IR/IF) Clock Position: 7 Mounting Ears: Precision-fit Terminals: B+ (M6x1.00), S/L (Spade) Weight: Approx. 8.4 lbs Compatibility: This alternator is compatible with a wide range of Mercury 4-stroke engines, including but not limited to: Mercury 135HP - SN 2B131942 & Up Mercury 150HP - SN 1B905505 & Up Mercury 150HP ProXS - SN 2B550139 & Up Mercury 150HP SeaPro - SN 2B139139 & Up 150L / 150XL / 150CXL SeaPro (2012-2020) Replaces OEM #: 8M0057693, 8M0062515, 8M0065239 Also compatible with: ARROWHEAD AND0626, J&N 400-52434 Why Choose This Alternator? This is not just another generic marine alternator. It's purpose-built for Mercury outboard engines, with a focus on: True fitment — just match your OEM number to ensure a perfect install Stable charging — 55A output supports all your marine accessories Built to last — corrosion-resistant housing and sealed internals Easy install — factory-style terminals and mounts for DIY replacement Fitment Reminder: Before purchase, please: Compare your OEM part number with our listing (8M0057693 / 8M0062515 / 8M0065239) Check pulley size (64mm OD), mounting ear dimensions, and terminal types Reach out with your engine serial number if unsure—we're happy to help Trusted by Marine Owners Worldwide This alternator is ideal for anyone maintaining their Mercury outboard, whether you're heading out for a fishing trip, towing your kids on the lake, or just cruising. No more guesswork or questionable rebuilds—install and go with confidence. Don't let a dead alternator keep your boat at the dock. Order today and get back on the water with a marine alternator that performs when it counts.