There is an excellent article on testing for grounding problems between
shore power and boat at: http://www.yandina.com/electrolysis.htm
Gene
SV Sea Gypsy

"Chuck Baier" wrote in message
om...
Our marina has a problem at some slips with stray current. Some of the
boats are loosing zincs at a fast rate while others are not. Looking
for some help in trying to resolve this and what kind of equipment
will I need. Thanks. Chuck