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Without really meaning to sound glib, the first place to start is by reading the manual for your cathodic protection system and determine just what the indicators are trying to tell you.
If you don't have a manual, contact the manufacturer of the system and ask their technical people to explain how the system works and at the same time order the manual.
Then, find a textbook on marine corrosion protection, or since you have an internet connection, search on those keywords.
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