Regal 3300 Owner's Manual page 169

RECEPTACLE FOR SHORE
EXTENSION CORD
boats such as stainless steel.
At the end of the day, you want your underwater metals protected,
and you want your zincs to erode at a predictable rate for ease of
maintenance.
With the galvanic isolator installed as part of your battery charger
option, it effectively isolates your boat from others around you (blocking
any damaging DC flow) while still maintaining the integrity of the
shore power safety ground (extension cord plugged into dockside).
The galvanic isolator is the best way to prevent damage to vital metal
parts on your vessel.
Refer to the equipment manufacturer's manual for additional
information.
https://www.boat-manuals.com/
Features
As soon as this extension
cord circuit is activated it
is also connected to the
dock and all the other
boats around you. Your
boat is now part of a
larger electrical system
(Galvanic cell).
Bottom line is that the
zinc anodes on your
vessel and drive may
erode at a much faster
rate due to stray current
in the water. Zinc is more
sacrificial than many
other metals used on
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