"claus" wrote in
:

After reading all the very helpful responses to my initial post I am
now leaning towards the theory that the prop is somehow electrically
isolated from the engine block (and the large zinc)- as unlikely as
that seems. However, I won't know until the next haul-out when it can
be checked with a meter.



All it needs is a rubber damper to isolate it, electrically......



--
There's amazing intelligence in the Universe.
You can tell because none of them ever called Earth.