Generator and Electrical systems grounding on a Houseboat Generator and Electrical systems grounding on a Houseboat. He had an galvanic isolator installed on the ground wire of his 120 volt system. The negative or ground side of his 12 volt battery banks were connected to the aluminum hull. We wondered if he should wire it to the hull, or wire it to the 120 volt galvanic isolator ground green wire side. Houseboat wiring - screamandfly Mar 07, 2010Houseboat wiring; If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.