Hi Chuck,

Thanks for setting my mind at ease.

First question: are the bronze seacocks connected electrically (i.e., by
wire) to your engine ground? If not, you have nothing at all to worry
about.
No, they are not.

If they are grounded by wire, is there a reason? There are many
different bronzes, of course, but in the old days, they would last the
life of the boat. Were they replaced 4 years ago because of corrosion or
failure?

No, that's when the boat was built.

I believe a reasonably knowledgeable diver would be able to detect
energetic corrosion of the seacocks, as well as any other underwater
metals, like the ruddershaft. I gather you used a diver to inspect your
prop shaft zincs after you installed the isolator but you didn't check the
seacocks at the time?

No, I replaced the prop shaft zincs when the boat was hauled out in May.


Good luck, and hopefully, suspend the paranoia.

Suspended now...with thanks.

Claus