Don't let a corroded alternator ruin your day on the water. This replacement uses anti-corrosion materials and sealed housings to survive saltwater service season after season. Verified to fit Mercruiser. Cross-references part number 863077, 19020611. Always check connector type, mounting pattern, and physical dimensions against your existing unit before ordering. Ships ready to install — no modifications required. Common symptoms that point to this part: no crank, slow crank, intermittent starts, no charge, dim lights, or dashboard warning lights. Always check the battery state of charge and ground connections before swapping. Pro mechanics and DIY enthusiasts trust this build for daily-driver and weekend-rig service. If you're unsure about fitment, message us with your VIN or chassis number and we'll confirm the match before you order — order with confidence.