Peter – thanks for this. The answer is I don’t know …. all I know is that the original purchase receipt shows that the first owner had a supplementary anode fitted when the boat was delivered. It is a pear anode. Of course, I was at the boat yesterday, not today, so I cannot check now. From memory the anode is wired to the sail drive. What is the correct method? Can you get a picture of your installation? Thanks, Jonathan