How to check
I too was using zincs so I had a buddy who is also a marine electrician down to the boat. He found that there are two galvanic isolators supplied by Hunter. This is on a 410. They were not hooked up properly. He made the connection.Then he went to the source of our shore power, turned off the power, removed the male end of the cord, and stuck the black lead into the ground. The positive lead was placed into the water. The reading was .75 volts. I told our marina management about it, but nothing was done other than to send me a letter thanking me for my concern.John Richards/v Jack's Place