Strange 24DC leakage

Sv Garulfo

Hi everyone, 

Our DC leakage detector is showing a leak on the negative. I investigated any AC charger + DC USB potential issue as mentioned previously on the group and didn't find any culprit. 

However, it highlighted this strange fact: when I push the switch up to test for bad connection between negative and grounding, the light comes on and slowly goes off in about 3 seconds. If I test again, it doesn't come on. I need to wait for 10 , 15 minutes for it to 'recharge'. It looks like a capacitor discharging. 

Has anybody experienced this before? Does it give a clue to what could be the source of the leak?

Otherwise I'll start the usual investigation disconnecting everything from the batteries end.

Thanks in advance,

Fair winds 


Amel 54 #122
Saint Martin, FWI

webercardio <webercardio@...>

Hi Thomas and Bill,
I had the same problem,  measured the current over the indicatorlight,  disconnected all wires (negativ and positiv) of all equipment in contact with salt/waterpumps. I could not find the fault and had to leave the boat for several weeks. When I returned the test worked fine  - no Indikator light. This was 18 months ago-still no problems.
After this I check it daily, sign the logbook. Minimum test before and after any work at the electric System.
Once I had a light on the tester,  when I made a HDMI connection between the TV and the Furuno Navnet.
Wolfgang Weber SY Elise Amel 54#162


Same with me! Happens SOMETIMES, never found the reason.


ofer magen

Hi to all. 
I have this fenomena too. 
I traced it to the forward sail locker. There is always a lot of humidity there. Last time I was on the boat I dried all the electrical parts and sprayed it with corrosion x and greas. 
Light went off. 
I hope it will stay like this for a while... 

I hope it helps, 

Ofer Magen
Alba Amel54 160


We  had the same.  Comes and goes.  Eventually we discovered it was dependent on another boat near us--  it would happen when the other boat docked andhooked up to shore power, then disappear when it left.  Months later, in another location it happened again.  I have had the feeling we were ending up detecting a leak in a nearby boat (boats at most marinas share the same ground, even use your zincs if they don't have them).  I have no idea how this is possible, maybe some of you with more electrical knowlege do!  We also have a galvanic isolator with detection as well and no correlation with its indicators.  The only time our galvanic isolator showed a leak was in a questionable marina in Greece.  Tests with a volt meter showed the galvanic isolator was solving the problem even though indicating a fault.  The Amel indicator showed no fault. BTW the addition of a galvanic isolator slowed our rudder zinc loss to near zero.  

Bob and Suzanne, KAIMI SM 429 In the water in Malta

PS Adm Bill--should I post my Amel WOB results?