Appreciable drive shaft anode erosion

[Frank]

is it due to the exposure to a lead keel and/or exposed steel in a damaged rudder post?Or is it possibly due to reverse polarity in the marina or someone’s boat tied up in that marina?The few AC ckts that are aboard might have a broken common line and running to ground through the hull fittings, but how about the DC ckts; are they possible culprits? Who knows what evil lurks in the dark of the below decks? Could he be the spirit of Dank, son of Doom?

 

[MArk of OSMS]

First we bond (or not!)

Frank,Even the "experts" disagree on the best galvanic protection practices. The ABYC says not to bond the thru-hulls to avoid corrosion then says bond the thru-hulls for lightning protection. What to do?Check the article below.Suggested reading:"Boatowner's Mechanical & Electrical Manual: How to Maintain, Repair, and Improve Your Boat's Essential Systems" - Nigel CalderLong name; great reference. Very thorough. You won't know how you lived without it. "Sailboat Electrics Simplified" - Don CaseyA good beginner book.Happy sails *_/),MArk

 

[Frank]

Mark

Thanks for the information Mark.Will look up the publications.Good sailing to you and yours.Frank