Masse negative leak

ngtnewington Newington

Back sailing and all well aboard Amelia here in the windy Cyclades.
Since launching a few days ago I have found that the “ Masse” leak to the bonding system lights up on the negative side.
So far I have checked
1. both WC Motors
2. All the fans
3. Fridge system water cooling pump

There are clearly many potential candidates but the most likely????
Bulge pump? Windlasses? 24v alternator? Electric furlers??

Any ideas as to the most likely candidates?

Amelia sailing towards Siros. Greece.
AML 54 -019

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