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When purchased, the Previous Owner had all the DC circuits hot-wired
to the 12-volt supply at the lower helm. There was no DC master on/off switch.
Individual on/off switches were used to control power to all the various circuits,
lighting, accessories, etc. Another problem discovered early on was that the
12-volt supply wires were too small to carry enough current to deliver constant
power under load. When the horn button was pressed, the instruments (GPS,
radar) would power off! That was unacceptable. So, new 6 AWG positive and
negative feeder cables were routed up from the engine room and were connected
to the house battery bank. The original positive feeder cable was abandoned.
I installed a new 12-V master control switch under the helm and routed cables
to the positive and negative bus bars under the helm. Now, all circuits receive
a healthy 12-V power source with no degradation of current. And, I can turn off
the master to deenergise all the instruments, circuits and lighting.
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