West marine advisor has an excelent boat grounds artical at
http://www.westmarine.com/webapp/wc...01&page=Marine-Grounding-Systems#.UdgpdVM0eo0
This is not a DC ground and you are done type of operation. DC, AC, power sources on-board and shore power, galvanic, lightning and radio grounds ALL MUST BE INCLUDED in the solution or you will have problems.
I"m with MainSail on this one, DC leaking (probably from the bilge wiring, switch, motor) and zooming up the erosion of the zincs.
http://www.westmarine.com/webapp/wc...01&page=Marine-Grounding-Systems#.UdgpdVM0eo0
This is not a DC ground and you are done type of operation. DC, AC, power sources on-board and shore power, galvanic, lightning and radio grounds ALL MUST BE INCLUDED in the solution or you will have problems.
I"m with MainSail on this one, DC leaking (probably from the bilge wiring, switch, motor) and zooming up the erosion of the zincs.