When we first took possession of Eolian, I was tracing down the reason for no forward running lights. I found this, on a section of wire suspended in a long run thru the bilge.
Presumably there had been a nick in the insulation, which in this case was serving as both electrical and environmental insulation. Over the years, the moisture had accelerated the oxidation of the copper, and had burst the insulation. The copper wire was simply gone.
It would be best if there were no connections in electrical wiring in the bilge. If connections there must be, you should use the crimp connectors with the heat shrink insulation that has the soft sealing resin-glue inside.
And no nicks in the insulation are allowed.
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