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6.1 General
Your boat is equipped with a 12 volt DC electrical
system and a 120 volt AC battery charging system.
The battery charger draws current from a shore
power outlet at dockside. The DC system draws
current from onboard batteries.
Your boat and engine charging system is designed
for 12 volt marine batteries. All wires in the elec-
trical systems are color coded to make identifying
circuits easier.
6.2 DC System Overview
The 12 volt system is a fairly standard marine sys-
tem. Boats without a Seakeeper are equipped with
3 batteries, one for each engine and one for the
house and electronics. Boats with the Seakeeper
option are equipped with 4 batteries, one for each
engine and two for the house, optional Seakeeper
and electronics. The House batteries are connected
to the engine auxiliary charging circuits.
The batteries are located below the helm seats or
in the forward head storage compartment when
the Seakeeper option is installed. The engine and
house battery systems are controlled by three
battery switches, one for each engine and one for
the house 12 volt accessories and electronics. The
batteries are charged by the engines or the battery
charger when connected to shore power.
Most 12 volt power is distributed to 12 volt acces-
sories through individual circuit breakers and fuses
located near the batteries and battery switches, at
the helm and in the hardtop. All circuit breakers
or fuses are labeled with the name of the circuit
they protect.
Main circuit breakers near the battery switches in
the aft systems compartment protect the primary
circuits for the DC main, electronics, windlass and
other accessory circuits. Additional main circuit
breakers behind the helm protect the stereo am-
plier, digital switch modules and the windshield
hydraulic circuits. Other fuses in panels behind
the helm protect continuous power circuits for the
stereo memory, automatic switches for bilge pumps
and high water alarm, selected 12 volt accessories
and the helm battery switches.
Most 12 volt accessories are operated by switches
in the helm switch panels, head compartment or
digital switches in the Garmin displays. Most ac-
cessory circuits are protected by circuit breakers
in the digital switch control modules or fuses in
the accessory fuse panels.
Main breakers or fuses located on each engine pro-
tect the ignition systems and gauge panel display.
Other main, heavy duty fuses or circuit breakers in
the aft systems compartment protect the primary
engine control circuits on boats equipped with
dual Yamaha engines and Helm Master controls.
Yamaha engine electrical circuits are protected
by fuses located in a fuse panel on the side of
the engine. The engine fuse panels are equipped
with a spare fuse for each circuit. Always replace
fuses used with the fuse specied by the engine
manufacturer. Refer to the engine owner’s manual
for more information on the fuses, fuse panels or
circuit breakers on your engines.
PROPER FUSE OR BREAKER PROTECTION MUST BE
PROVIDED FOR ALL 12 VOLT EQUIPMENT ADDED. DO
NOT OVERLOAD THE ACCESSORY CIRCUIT BREAKERS
OR OTHER CIRCUITRY THROUGH ADDITIONAL 12 VOLT
EQUIPMENT.
6.3 Batteries & Battery Switches
The DC electrical system on your boat is designed
for 12 volt marine batteries only. The batteries are
mounted in vented compartments below the helm
seats or in the forward head storage compartment,
depending on the options selected.
Use only marine wet cell or AGM batteries. Never
use gel cell or lithium batteries. The engine charg-
ing system and/or the battery charger may not
be able to recharge gel cell or lithium batteries
properly which could cause unusually short battery
life, engine starting problems and damage to the
DC charging systems.
You also should not mix the size or brand of bat-
teries. Always consult your dealer before changing
the type of batteries in your boat.
Chapter 6:
ELECTRICAL SYSTEM
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