To Captn Dave
I'm sorry, my semantics are wandering. I used the term ground but as you pointed out (thank you) I did in fact mean bonding. The question would be then, is it neccessary to have a zinc directly on the lead keel, or to run a BONDING wire from the keel bolts (stainless) to a dedicated bonding loop when the only submersed metals are the keel, the rudder shaft and sometimes the outboard. The boat is 1983 and showing no signs of galvanic corrosion even though I can't find a zinc anywhere. There may have been one, but I bought it on the hard and I cant see anything.