|
03-07-2019, 11:02 AM
|
#1
|
Member
City: Sarasota
Join Date: May 2018
Posts: 5
|
Current Leakage Eating Zincs?
Hi, All. Probably been covered many times, but here goes: Divers replaced my shaft zincs 30 days ago (older Mainship), and today found they've been "consumed." Boat is connected to 30-amp shore power, and only AC equipment that's been running lately are the battery charger and small refrigerator.
I assume it's a current "leakage" (bad ground on boat or shore?).
Suggestions? Where do I start? Thanks.
|
|
|
03-07-2019, 11:06 AM
|
#2
|
Guru
City: East Coast
Vessel Name: M/V Maerin (Sold)
Vessel Model: Solo 4303
Join Date: Jun 2013
Posts: 886
|
Start with the DC. AC current won't consume zincs like DC will. You can check for AC shore power leakage with a clamp on AC current probe.
Perhaps a bilge switch that's failing or some DC wiring laying in the bilge that's leaking to a thru hull fitting via the bilge water.
|
|
|
03-07-2019, 11:26 AM
|
#3
|
TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,681
|
Have a corrosion analysis done by a certified ABYC tech. It’s should take about an hour with you helping. He’ll be able to tell exactly what the problem is plus the remedy.
|
|
|
03-07-2019, 11:50 AM
|
#4
|
Guru
City: Narragansett Bay
Vessel Model: Grand Banks 36 Classic #715
Join Date: Sep 2016
Posts: 1,857
|
“Perhaps a bilge switch that's failing or some DC wiring laying in the bilge that's leaking to a thru hull fitting via the bilge water.”
What Steve said. Could also be another boat close by with DC voltage leaking into the water. (DC wire hanging in the water in their bilge) Any new boats around? Ask neighbors if they are consuming zincs.
Maybe have to hire an ABYC guy as stated above.
By one of these until you get it sorted out.
https://www.boatzincs.com/hanging_an...yABEgJd__D_BwE
|
|
|
03-07-2019, 12:03 PM
|
#5
|
Guru
City: Reedville, VA
Vessel Name: Wingspan
Vessel Model: Aluminum Catamaran
Join Date: Aug 2018
Posts: 580
|
Quote:
Originally Posted by Larry M
Have a corrosion analysis done by a certified ABYC tech. It’s should take about an hour with you helping. He’ll be able to tell exactly what the problem is plus the remedy.
|
I like this advice and will follow it myself. Plus, helping him with the work would be very educational since problems are likely to come up again someday. That's an hour worth of billing that will pay dividends.
|
|
|
03-07-2019, 12:08 PM
|
#6
|
Guru
City: Narragansett Bay
Vessel Model: Grand Banks 36 Classic #715
Join Date: Sep 2016
Posts: 1,857
|
Quote:
Originally Posted by Bkay
I like this advice and will follow it myself. Plus, helping him with the work would be very educational since problems are likely to come up again someday. That's an hour worth of billing that will pay dividends.
|
Agreed. Great advise!
|
|
|
03-07-2019, 01:57 PM
|
#7
|
Guru
City: Jacksonville
Vessel Name: Alzero
Vessel Model: Hatteras 63' CPMY
Join Date: Apr 2017
Posts: 1,548
|
What if the problem is the marina or your neighbors boat? Neither may be willing or even able to correct the situation. If that’s the case, maybe one of those auxiliary fish anodes that you clip to the bonding system and hang over the side like previously mentioned will help.
|
|
|
03-07-2019, 07:01 PM
|
#8
|
TF Site Team
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,663
|
30 days is awfully quick to totally consume shaft zincs. Did your diver report simply that the zincs were gone? If he didn't produce the remnants, how do you know that they didn't fall off due to incomplete installation 30 days before?
__________________
Keith
|
|
|
03-07-2019, 07:39 PM
|
#9
|
Guru
City: Seattle
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 4,308
|
I have more questions than answers. First, is there a galvanic isolator installed?
|
|
|
03-08-2019, 01:18 PM
|
#10
|
Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
|
*IF* the problem turns out to be the dock wiring or a nearby boat, a galvanic isolator is one of the best remedies (other than unplugging)
|
|
|
03-08-2019, 02:43 PM
|
#11
|
Guru
City: Mississippi
Vessel Name: ADAGIO
Vessel Model: CHB Present 42 Sundeck
Join Date: Jul 2014
Posts: 920
|
Quote:
Originally Posted by tiltrider1
I have more questions than answers. First, is there a galvanic isolator installed?
|
I ordered a 50amp Galvanic Isolator last week for our 'new to us' boat. Easy to install, and can't hurt
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Trawler Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
All times are GMT -5. The time now is 11:39 AM.