My boat does not have any metalic through hulls at all, and it doesn't
even have keel bolts. The only through hull is for the speed/log.

The bonding ground is really to prevent electrolysis by preventing a
differential potential between fittings. With an inboard you are stuck
with metal in the water - we are not.

Matt

First, I am certainly no expert in electrolysis prevention techniques,
but since there are apparently none responding, Here's my 2 cents worth:
When the outboard is in the water, there is certainly metal in the
water, and often considerable cavitation. That, along with the rudder, which
usually has an aluminum or stainless steel post is more metal. Chain plates
for shroud, back and fore stays are usually metal too? Often in or covered
with water, no? Again, no expert here.
Lynn