Keep your outboard running strong all season with this spec-matched marine replacement alternator. Built for the brine, spray, and high-load cycles that define real boating. Verified to fit Mercruiser. Cross-references part number 400-46025. 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. Quality-tested before shipping — every unit passes incoming inspection. 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.