You need to have your whole
electrical setup examined by a technician who specialises in
boats. I engaged one in Opua, NZ, 15 months ago. He assessed the setup on my recently purchased yacht, found shortcomings I was aware of, found a few more, ordered the
parts, and a week later came down and sorted everything out. About $700 for
parts and $350 for labour.
Money well spent and everything has run sweetly since. Cameron Murray of Trans
Marine Pro, if you find yourself round Bay of Islands way...