Preview: Outboard and Sterndrive Corrosion

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This is a preview of Outboard and Sterndrive Corrosion which is part of the newest round of ABYC Online Learning Courses.

The cathodic protection systems is more than just an anode here and there bolted to an outboard or sterndrive. Learn from veteran technician and ABYC technical instructor Rob Berenwick how the system works, how to perform some basic testing and things to look out for to protect your customer's investment. You'll learn how the anodes actually protect the materials they are intended to, how an impressed current system varies its protection based on environmental factors and more.

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Hi Sir, I have 2 Yamaha 90 outboards 4 stroke. And I am having a problem of corrosion happening on my lower leg units on both legs. The electric current is bypassing my zinc anodes and hitting the lower leg units, corroding them really badly! I dont have any idea where to look and everyone says it's a grounding issue!! Any suggestions where to look? Ive looked at all the wiring and it all looks good! I dont see no breaks or cracks, it's very frustrating because my lower legs are getting eaten up really badly!! Any suggestions?

danielkim