Sierra 18-5983 SIER ALTERNATOR All Sierra Alternators Meet or Exceed USCG, SAE J1171 and ISO 8846 Safety Standards 100% Load Tested for Assured Reliability Out of the Box Marine Grade Containing Heavy-Duty Bearings and Regulators for a Longer Service Life Contain High Quality Stators and Heavy-Duty Rectifiers for Maximum Efficiency Before Ordering, Please Verify this is the Correct Part for your Application. For Assistance, Please Call Sierra's Tech Support at 1-877-663-8414 All Sierra parts qualify for and are covered under Sierra's Industry Leading Customer Satisfaction Warranty