Get back on the water with this direct-fit replacement alternator engineered for marine duty. Built to handle the moisture, vibration, and load demands of inboard or sterndrive service. Verified to fit marine applications . Cross-references part number 271940, 230-12243. 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.