Arco Starting & Charging SW661 Solenoid for Mercruiser and Mercury Marine

The Arco Starting & Charging SW661 is a heavy-duty marine solenoid designed as a direct replacement for Mercruiser and Mercury Marine starting systems. This 12-volt solenoid features an isolated base design that provides reliable electrical separation and prevents ground loop interference in marine electrical systems.

Key Features:

• Direct replacement for Mercury part numbers 25661, 25661-1, and 25661-T1
• 12-volt operation for standard marine electrical systems
• Isolated base design prevents electrical interference and improves reliability
• Heavy-duty construction for harsh marine environments
• Corrosion-resistant terminals and housing

This solenoid is specifically engineered for marine applications where exposure to moisture, salt spray, and vibration require components built to withstand demanding conditions. The isolated base configuration makes it ideal for systems requiring clean electrical separation between control and power circuits.