For Mercury Marine Models:
20hp Engine 1984-1994

Compatibility Voltage 12V DC Terminal Configuration 4-terminal (2 heavy-duty battery/starter posts, 2 small signal trigger posts) Housing Construction Reinforced impact-resistant ABS housing with corrosion-resistant steel mounting brackets Internal Contact Material Silver-plated high-conductivity copper Ingress Protection Rating IP67 waterproof, dustproof and salt-spray resistant OEM Cross Reference Part Numbers 89-817109A1, 89-817109A2, 89-846070, Sierra 18-5818 Operating Temperature Range -40°F to 185°F (-40°C to 85°C) Mounting Hole Center Spacing 2.75 inches (70mm) Maximum Current Handling Capacity 200A continuous, 800A peak for 10-second cranking cycles Internal Sealing Treatment Epoxy-potted internal components to resist moisture and vibration damage Cranking Response Time ≤10ms under rated voltage Warranty Period 12 months unlimited usage from purchase date