Monterey Boats Sport Yacht 330, Owner'S Manual

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330 SPORT YACHT
Chapter 4:
ELECTRICAL SYSTEM
4.1 General
Your Monterey is equipped with 120-volt AC and
12-volt DC electrical systems. The AC system
can draw current from one of two sources, either
shore power outlets at dockside or the genera-
tor. The DC system draws current from on board
batteries.
The 12-volt batteries in your boat are usually the
lead-acid type. They will require similar mainte-
nance as those found in automobiles.
4.2 12-Volt System
The 12-volt system is a standard marine system.
There are four batteries, one for the starboard
engine, one for the port engine, and two in parallel
for the house, accessory circuits and the gen-
erator. The batteries themselves can be charged
by the engines or by the battery charger when
hooked to shore power or when operating the
optional generator.
An automatic battery isolator/relay manages the
charging current for the starboard engine and
house batteries. Whenever the starboard engine
is running, the isolator/relay automatically senses
the condition of each battery bank and directs
the available current to the batteries that require
charging. The port engine battery is charged by
the port engine. The system is equipped with a
battery parallel feature that will connect both en-
gine starting batteries in parallel for extra battery
power while starting the engines. The battery
parallel switch is activated by a momentary rocker
switch located in the helm switch panel. When the
switch is pressed and held for three seconds, a
relay is engaged that connects both engine start-
ing batteries. Once engaged, the relay remains
activated for ten minutes and then automatically
deactivates and the batteries are isolated.
Most 12-volt power is distributed to the 12-volt
accessories through individual circuit break-
ers located in the 12-volt breaker panels in the
cabin, at the helm and in the breaker panel near
the battery switches in the engine compartment.
Main breakers located in the engine compartment
breaker panel protect the house, helm systems
and windlass from an overload. Other circuit
breakers in the engine compartment panel pro-
tect the battery charger DC circuits, stereo and
electronics memory, engine control memory, CO
monitors, sump pump, amp and the automatic
switches for the bilge pumps and the high water
alarm. Main breakers located on each engine
protect the ignition, charging systems and gauges.
Some 12-volt accessories are operated directly by
a circuit breaker in the cabin breaker panel while
others are operated by a switch fed by the panel
breakers. Most of the 12-volt accessories on the
deck and in the cockpit are operated by switches
in the helm switch panel.
Battery Switches
There are three “ON” - “OFF” remote activated
battery switches located on the battery switch
panel in the engine compartment. The battery
switches are equipped with relays that are ac-
tivated by labeled rocker switches in the cabin
breaker panel. Red LED lights in each switch glow
to indicate that the switch is activated. The bat-
tery switch labeled “Port Engine” activates the port
engine, the battery switch labeled “Starboard En-
gine” activates the starboard engine, the battery
switch labeled “House” activates the DC breaker
panel in the cabin and all other 12-volt accesso-
ries, including the optional generator. Make sure
Battery Selector Switches, Circuit Breakers and Charging Relay