I have just bought a fibreglass sailboat that needs rewiring. Reading
Don Casey's book "Sailboat Electrics Simplified", he states that the
battery MUST be properly grounded to the engine block. That's fine if
the boat has an inboard engine - but does this mean that I have to run
a grounding cable through the boat to the stern and attach it to the
outboard engine? Or is there an alternative "earth" on a fibreglass
boat?