1 other thing
Therm spoke of zincs, they are a good thing, just don't think more is better, because it can work against you with aluminum (outbd or outdrive).
Make sure yours are still healthy (thickness & length) and replace if not, also you can add another but attach it to the swimplatform to direct some of the electrolites away from the aluminum.
Test data I did with the Navy on Submarines showed more is not always better.
Just my .2 cents.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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