Had sparkies onboard last week checking us for stray current
as on the last slip we had a bit of blown paint
due to a poor grounding plate and connection.
They suggested we fit one of these when out which i did , redid the grounding wire and they said its better to give the boat
some time to settle down before rechecking.
On the check it was noted a slight discrepancy between the rudder
and the engine
and grounding them was recommended.
After a look around they said running the ground for engine off of alternator negative
was as good a spot as any but now I am second guessing them.
I have the gear
now and i am running a hefty tinned cable from rudder
post to ground plate and from engine to ground plate.
Instead I was going to use a cleaned up bolt sticking out of the block, as one usualy does when connecting earth to engine, theory being that the alternator
, due to what it does, may have more chance of actually introducing current
to the water
than a bolt on the engine.
Plus I feel a bit uneasy about having an integral part of the engine wired up in this way.