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It sounds as if your electrical engineer friend wants you to use the negitive
side of the electrical system as the hull of the boat, which I presume is
metal (steel, alumium, or monel).
This is not a good idea. It can cause excessive electrolysis, plus a number
of other problems in the grounding and protection systems. There are too many
problems to even list in a short post.
Even in a steel boat, the negitive part of the system should be in cables,
with proper single point attatchment and proper isolation from the ground and
bonding systems.
Bob Austin
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