Section 5 - Maintenance
90-8M0053363
eng
NOVEMBER 2010
Page 103
Corrosion Protection
Corrosion Information
Whenever two or more dissimilar metals are submerged in a conductive solution, such as saltwater, polluted water or water with
a high mineral content, a chemical reaction takes place causing electrical current to flow between metals. The electrical current
flow causes the metal that is most chemically active, or anodic, to erode. This is known as galvanic corrosion. For more information
contact your authorized Mercury MerCruiser dealer and refer to the
Mercury Precision Parts / Marine Corrosion Protection
Guide
(90‑881813003).
Maintaining Ground Circuit Continuity
The transom assembly and sterndrive are equipped with a ground wire circuit to ensure good electrical continuity between the
engine, transom assembly, and sterndrive components. Good continuity is essential for the MerCathode System to function
effectively.
MerCathode System Battery Requirements
The Mercury MerCruiser MerCathode system requires a minimum battery charge of 12.6 volts at all times to maintain functionality.
Boats equipped with a MerCathode system that use shore power, and are not run for a long period of time, must use a battery
charger to maintain a minimum battery charge of 12.6 volts or above.
Boats equipped with a MerCathode system that do not have access to shore power must be operated often enough to maintain
a minimum battery charge of 12.6 volts or above at all times.
Anodes and MerCathode System Locations
IMPORTANT: Replace sacrificial anodes if eroded 50 percent or more.
The anodes protect the metal components on the power package from galvanic corrosion, and erode slowly over time. The
following sacrificial anodes are installed at different locations on your power package.
MerCathode System—
The electrode assembly replaces the anode block. The system should be tested to ensure adequate
output. The test should be performed where boat is moored, using Quicksilver Reference Electrode and Test Meter.
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