I installed a galvanic isolator which in effect breaks the green wire
circuit for making this "battery", yet maintains the ground protection.
My zincs have not eroded as much since I did this.

"Jean Dufour" wrote in message You know
that, thru the AC ground lead, all boats plugged into the dock supply are
connected together. If you have an aluminum
prop and your neighbour, a brass one, you're making a battery together
even without problem in the dock wiring. Check if the
boats without problems are all equiped with a brass prop (or marine
stainless) and if those who have corrosion issues don't.
It's just a guess but if so, I don't think the problem is with the dock
wiring.

Best way to prevent that, in ANY cases, even if no apparent problems are
experienced, is not to leave the shore power cord
plugged while you're not aboard. If your batteries can't keep their charge
during the time you're not there, then it may be
time to replace them. Anyway, doing this while the marina checks its
wiring should prevent any further problems.

Jean Dufour
Montreal, Qc

I installed a galvanic isolator which in effect breaks the green wire
circuit for making this "battery", yet maintains the ground protection.
My zincs have not eroded as much since I did this.

"Jean Dufour" wrote in message You know
that, thru the AC ground lead, all boats plugged into the dock supply are
connected together. If you have an aluminum
prop and your neighbour, a brass one, you're making a battery together
even without problem in the dock wiring. Check if the
boats without problems are all equiped with a brass prop (or marine
stainless) and if those who have corrosion issues don't.
It's just a guess but if so, I don't think the problem is with the dock
wiring.

Best way to prevent that, in ANY cases, even if no apparent problems are
experienced, is not to leave the shore power cord
plugged while you're not aboard. If your batteries can't keep their charge
during the time you're not there, then it may be
time to replace them. Anyway, doing this while the marina checks its
wiring should prevent any further problems.

Jean Dufour
Montreal, Qc

Chuck Baier wrote:

Rodney, This is a condo marina. They will fix the problem but have no
idea how to track it down. Since it directly affects my boat I will
try and assist them in finding the source. That is why I posed the
question. Chuck

You know that, thru the AC ground lead, all boats plugged into the dock supply are connected together. If you have an aluminum
prop and your neighbour, a brass one, you're making a battery together even without problem in the dock wiring. Check if the
boats without problems are all equiped with a brass prop (or marine stainless) and if those who have corrosion issues don't.
It's just a guess but if so, I don't think the problem is with the dock wiring.

Best way to prevent that, in ANY cases, even if no apparent problems are experienced, is not to leave the shore power cord
plugged while you're not aboard. If your batteries can't keep their charge during the time you're not there, then it may be
time to replace them. Anyway, doing this while the marina checks its wiring should prevent any further problems.

Jean Dufour
Montreal, Qc

Rodney, This is a condo marina. They will fix the problem but have no
idea how to track it down. Since it directly affects my boat I will
try and assist them in finding the source. That is why I posed the
question. Chuck



Rodney Myrvaagnes wrote in message . ..
On 19 Apr 2004 19:48:16 -0700, (Chuck Baier)
wrote:

Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck

I don't know what you expect to do. The marina has to fix it. We had
that problem for two seasons. I got a little testing gizmo that plugs
into a grounded receptacle and lights various LEDs to tell what is
happening.

The ground on one whole dock was open. That was over 100 boats. They
did fix it, but I had to have a diver replace zincs partway threough
the season once.



Rodney Myrvaagnes NYC J36 Gjo/a


Capsizing under chute, and having the chute rise and fill without tangling, all while Mark and Sally are still behind you

Rodney Myrvaagnes wrote in message . ..
On 19 Apr 2004 19:48:16 -0700, (Chuck Baier)
wrote:

Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck

I don't know what you expect to do. The marina has to fix it. We had
that problem for two seasons. I got a little testing gizmo that plugs
into a grounded receptacle and lights various LEDs to tell what is
happening.

The ground on one whole dock was open. That was over 100 boats. They
did fix it, but I had to have a diver replace zincs partway threough
the season once.



Rodney Myrvaagnes NYC J36 Gjo/a


Capsizing under chute, and having the chute rise and fill without tangling, all while Mark and Sally are still behind you

I normally do not keep my boat at a marina but did once for a couple
weeks. I dove to unfoul my prop and felt weird in the water, found my
zinc had dissappeared in less than a week. While looking at the zinc
with mask and snorkel, felt "tingly", suddenly realized what was
happening and got out of the water very carefully without grounding
myself to anything.

Rodney Myrvaagnes wrote in message . ..
On 19 Apr 2004 19:48:16 -0700, (Chuck Baier)
wrote:

Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck

I don't know what you expect to do. The marina has to fix it. We had
that problem for two seasons. I got a little testing gizmo that plugs
into a grounded receptacle and lights various LEDs to tell what is
happening.

The ground on one whole dock was open. That was over 100 boats. They
did fix it, but I had to have a diver replace zincs partway threough
the season once.



Rodney Myrvaagnes NYC J36 Gjo/a


Capsizing under chute, and having the chute rise and fill without tangling, all while Mark and Sally are still behind you

I normally do not keep my boat at a marina but did once for a couple
weeks. I dove to unfoul my prop and felt weird in the water, found my
zinc had dissappeared in less than a week. While looking at the zinc
with mask and snorkel, felt "tingly", suddenly realized what was
happening and got out of the water very carefully without grounding
myself to anything.

On 19 Apr 2004 19:48:16 -0700, (Chuck Baier)
wrote:

Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck

I don't know what you expect to do. The marina has to fix it. We had
that problem for two seasons. I got a little testing gizmo that plugs
into a grounded receptacle and lights various LEDs to tell what is
happening.

The ground on one whole dock was open. That was over 100 boats. They
did fix it, but I had to have a diver replace zincs partway threough
the season once.



Rodney Myrvaagnes NYC J36 Gjo/a


Capsizing under chute, and having the chute rise and fill without tangling, all while Mark and Sally are still behind you

"Chuck Baier" wrote in message
om...
Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck

When you figure this out, can you post it so I can do the same?

I was looking at a "Corrosion Test Meter" that is made by Guest. The
description in the West Marine catalog indicates that it might be just the
thing for this, but it doesn't give quite enough information and the Guest
website is useless. If this meter is the thing, I might consider buying
one, or if you buy one I will buy it off you (or rent it from you) when you
are done .

Rod McInnis

"Chuck Baier" wrote in message
om...
Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck

When you figure this out, can you post it so I can do the same?

I was looking at a "Corrosion Test Meter" that is made by Guest. The
description in the West Marine catalog indicates that it might be just the
thing for this, but it doesn't give quite enough information and the Guest
website is useless. If this meter is the thing, I might consider buying
one, or if you buy one I will buy it off you (or rent it from you) when you
are done .

Rod McInnis

There is an excellent article on testing for grounding problems between
shore power and boat at: http://www.yandina.com/electrolysis.htm
Gene
SV Sea Gypsy

"Chuck Baier" wrote in message
om...
Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck