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I'm only going to go in freshwater in this boat.
What size and how many magnesium anodes should I mount to my hull? I figured I'd put them under the water line on bare aluminum skin of the transum.
I only have one zinc on my motor and replace every couple years. I would only put one on and keep an eye. Unless you got a major issue or leave it in water near other boats that get shore power you shouldn't have an issue. Trailer queens like ours don't have the same risk.