Electrolysis, you have a bad ground somewhere in your system. It is seeking ground through trolling motor and parts of hull to water. If you don’t find problem and get repaired it will eventually eat holes in hull and eat up trolling motor.
This "chalky" growth began early spring on fairly new Ultrex skeg and is getting worse. Coating isn't scratched or chipped. Notice a few other spots on boat painted aluminum hull too but not as severe. I can scratch most of it off with fingernail. Boat is in fresh water lakes 3 days week maybe. Anode on Yamaha outboard is pitted but intact. What's causing this growth?
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Electrolysis, you have a bad ground somewhere in your system. It is seeking ground through trolling motor and parts of hull to water. If you don’t find problem and get repaired it will eventually eat holes in hull and eat up trolling motor.
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Charlie Weaver USN/ENC 1965-1979
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I checked and cleaned all terminals this spring . I'll get out test meter tomorrow and take another look.
Sent from my SM-G950U1 using Crappie.com Fishing mobile app
Early to bed, early to rise,
Fish like hell, make up lies.