New Mercury & Mariner Outboard External (Boat-Side) Wiring Harnesses 

At OBParts, explore our comprehensive selection of external (boat-side) wiring harnesses, designed for Mercury & Mariner outboard engines. Our catalog is organized by cylinder count—2-, 3-, 4-, and 6-cylinder engines—plus harness adapters for seamless compatibility. Whether you need to replace a worn harness or upgrade your rigging with reliable, tested components, our quality parts ensure a secure electrical connection and long-lasting performance.