Galvanic isolation

Possible galvanic problems

Erosion of saildrive

Erosion of propellers

Erosion of rudder stock

Erosion of thru hulls

Prop-speed/saildrive paint flaking off

Bottom paint around thruhulls flaking off

Dangers

When zinc anodes are not replaced

When connected to shore power

When there are wiring issues on a sailboat

Best practices shore power

Have an isolation transformer installed OR

Have a electrolysis blocker installed

Test your system annually to ensure the electrical systems are not causing anodes to be consumed at a fast rate.

Testing procedure: