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The cathode only draws power when in the water
My MerCathode draws power on the trailer. I have to pull the house battery terminal off if I leave the boat more than a week.
one thing about the mercathode was it trapped water underneath it and the manifold for the trim is taking a beating as a result. I am going to look at drilling some holes or something in it so it drains better- was not a huge deal but did kind of bother me....