I hope you're coating your connections with TefGel as you fix them.  :)

Dennis C.
Touche' 35-1 #83
Mandeville, LA

On Wed, Jul 19, 2017 at 8:49 AM, Bruce Whitmore via CnC-List <
cnc-list@cnc-list.com> wrote:

> Hello,
>
> We took over ownership of a 1994 C&C 37/40+ about 4 months ago.  At that
> time, we knew we had a battery issue.  As it turns out, after we replaced
> the batteries, we found that one of the battery banks was still not showing
> enough voltage getting to the panel.  I immediately suspected a bad ground,
> and when I went to tighten it, the ground cable made a crunching sound/feel
> when I pulled on it.
>
> I immediately replaced the ground cables, which fixed the problem.
>
> As I continue to address other electrical issues (lights and pumps that
> don't work, rotted speakers, etc.), I'm finding that in most cases, the
> negative wire at the far attachment to the appliance (speaker, pump, light,
> etc.), tends to be corroded.  Usually just green on the inside, but still
> usable, but in some cases it is requiring me to splice in a piece of wire a
> few inches away.  In one case where there is a light in the closet of the
> forward cabin, I will probably have to rewire with a new light due to the
> wires breaking through.
>
> Is this "normal" corrosion (the boat is in salt water), or is there a
> particular cause for only the ground wire to corrode?  Why is it not
> happening on the power wire as well?
>
> Does this indicate other issues I should watch out for?  I'm not seeing
> pink discoloration on seacocks, don't see issues on the engine, etc.
>
> Thanks in advance,
>
> Bruce Whitmore
> 1994 C&C 37/40+
> Madiera Beach, FL
> (847) 404-5092 (mobile)
> bwhitm...@sbcglobal.net
>
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