Quicksilver 8M0085693 Mercathode Kit Gen III Active Galvanic Corrosion Protection System

The Quicksilver 8M0085693 Mercathode Kit is a complete active cathodic protection system engineered by Mercury Marine to defend MerCruiser sterndrives against galvanic corrosion. Unlike passive sacrificial anodes, the Mercathode system delivers a controlled, low-voltage electrical current to underwater metals, continuously neutralizing the electrochemical reactions that cause galvanic corrosion damage to lower units, propellers, and other submerged drive components.

This kit features the Gen III Mercathode controller (black housing with blue decal), which mounts inside the boat and regulates protective current output. The included anode/reference electrode assembly installs in place of the standard zinc anode under the gimbal housing — no transom drilling required. The reference electrode continuously senses the corrosion potential of the drive in the water and automatically adjusts the controller to maintain optimum protection levels in any water condition.

Key Features:

• Active impressed-current cathodic protection — superior to passive sacrificial anodes alone
• Gen III controller mounts inside the boat; anode/electrode unit mounts under the gimbal housing
• No transom drilling required for installation
• Automatic self-regulating current output adapts to changing water conditions
• Especially recommended for boats equipped with stainless steel propellers or submerged stainless steel hardware
• Genuine OEM Quicksilver / Mercury Marine part
• Supersedes legacy part number 98869A14

Important Maintenance Note: The Mercathode system should be tested annually by an authorized Mercury dealer. Keep the anode/electrode clean and never paint over it, as coating will inhibit its protective function.