Corrosion

patonga

Recruit
Joined
May 10, 2009
Messages
3
I put new annodes on 6 weeks ago on my brovo 2 outdrives and looked yesterday. Saltwater use. no shore power for 6 weeks. As I previously suspected, there must be a current leak somewhere because one annode on one leg is zapped to about 70% and one on the other leg is about 75%. T
he strange thing is all the other annodes on the legs and the big one on the hull are untouched!!!
First question. Why only 2 out of 9 affected?
2nd question. Wher should I start looking for the stray current or is it a job for the pros?

Marina Disconected the batteries and still reckon they have a reading of point 6 of a volt. Where they read this from I don't know.
What I do next, I don't know. They seem to have given up and have directed me towards an electrical "expert". I'll let you know what happens.

Is it possible to still read .6 when the batteries are disconnected?

Pete
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,357
Re: Corrosion

When the bottom was painted did you keep 2 inches away from the transom housings? Is there another boat, power cord, lighting close by?
 
Joined
Apr 28, 2009
Messages
28
Re: Corrosion

When the bottom was painted did you keep 2 inches away from the transom housings? Is there another boat, power cord, lighting close by?

Excellent point. I see transom assemblies painted over with copper antifouling all the time and folks wonder why they have corrosion issues. I think the 2 inch gap reccomendation is one that gets overlooked often. Is there no bulletin published about this issue? If not maybe that would explain why it happens so much.
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,357
Re: Corrosion

Almost sure i`ve seen it in the manuals or a service bulletin,
 
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