This service and repair manual covers Mercury Mariner 15 HP 2-Stroke outboard motors manufactured between 1986 and 2003. These engines are designed for reliable performance in a variety of marine applications. The 15 HP 2-Stroke engine configuration is known for its robust engineering and dependable operation, making it a trusted choice for boaters. This manual provides comprehensive guidance for maintaining and repairing your Mercury Mariner outboard motor. It includes detailed information on general maintenance, troubleshooting common issues, engine and transmission service, electrical systems, cooling systems, fuel systems, and steering. Technicians and owners will find the included wiring diagrams and procedural instructions invaluable for ensuring the longevity and optimal performance of their motor.