I am rewiring my 68 holiday and im thinking why cant you ground your battery to the aluminum hull??? Im trying to lessen the wiring and it seems that this one way. Will corrosion play a big part to this? (new to this board & my first boat)
Don,t do it,run everything back to battery .Remember the negative line carries as much as the positive line, what I did was on my little Jupiter was run a two connector covered 12 gauge cable forward to the dash .