San Juan 26
Join Date: Oct 2006
Location: Robertsdale, AL
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Rep Power: 11
If it wasn't connected to anything, assuming it is a zinc anode, it isn't doing anything.
On that same line of thought, if there is no water in your bilge, an anode won't do anything either. Sometimes you see steel boats with zincs in the bilge, but these are usually worn out workboats or tugs that keep a fair amount of water in the bilge.
If there is no electolyte, i.e. seawater, for the zinc to conduct an electrical charge, it will be inactive.
If your bilge stays dry, there is no reason to attach the zinc to the keel bolts or anywhere else.
Jon Caisson Bozeman
S/V Little Miss Magic, Pirates Cove, AL