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37
Electrical System
ing circuits. Refer to the engine owner’s manual
for more information on the engine isolator and
charging system.
The engine and boat battery isolator systems man-
age the charging current for the 12-volt system
whenever the engines are running. The systems
automatically sense the condition of each battery
and direct the available current to the batteries
that require charging. When one or both engines
is started, the engine alternator(s) start to re -
charge the batteries. This charging current passes
through the battery isolator sensing circuits. The
circuits sense the charge and it is split between
the batteries, with the lowest battery receiving the
most charge. When the engines are turned off,
the charging stops and the sensing circuit turns
off each VSR and the engine isolators, discon -
necting the batteries from the charging circuit,
thereby automatically isolating the batteries from
one another.
When in port or at anchor, the battery switches
for each engine should be off. This will keep the
engine starting batteries in reserve for starting
the engines. All battery switches should be in the
OFF position when leaving the boat unattended.
NOTICE:
Current is supplied to the automatic float
switches for the bilge pumps and high wa-
ter alarm when the batteries are connected,
even if the battery switches are off.
Remote Battery Switches, DC Volt Meter and Battery Bank Monitor Switch
when the remote switch is turned OFF. LED lights
on each remote switch will be lit when the battery
switch is in ON and the circuit is activated. The
LED light will not be lit when the battery switch
is turned OFF.
The battery switches have two positions, OFF and
ON. When the House battery switch is on, current
flows from the house battery bank to the house
accessory circuits, cockpit accessory circuits and
electronics. When the engine battery switches
are on, the engine circuits are activated and cur-
rent flows from the port start battery to the port
engine and from the starboard start battery to the
starboard engine.
The optional bow thruster battery switch is lo-
cated near the house battery in the forward
storage compartment below the cockpit sole. It
is activated automatically when the thruster con-
trol panel is switched on and turns off when the
thruster control panel is deactivated. It also can
be activated manually with the red knob on the
battery switch.
Each engine charges the battery that feeds it and
the house and electronics batteries through a VSR
(voltage sensitive relay) battery isolator system.
Additional charging current is supplied to the
house battery bank by the engine onboard isola-
tor charging circuits. Two 50 amp circuit breakers
on each side of the stern systems station near
the transom protect the engine isolator charg-