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Engine/House Batteries and Battery Switch
The DC electrical system on your boat is designed
for wet cell, marine batteries. Do not attempt to
use gel cell, absorbed wet mat or other non wet
cell batteries. The engine charging system is
not designed to recharge these batteries which
could cause unusually short battery life, engine
starting problems and damage to the DC charg-
ing systems. You also should not mix the size or
brand of the wet cell batteries. Always consult
your Scout dealer before changing the type of
batteries in your boat.
Your boat has provision for two batteries. These
batteries should be of the size and capacity recom-
mended by the manufacturer of your engine. See
the engine owner’s manual. These specifications
should be considered to be the minimum size bat-
tery required. Consider increasing the capacity
of the battery if you will be trolling, drift fishing
or have extensive electronics on board. Larger
batteries will give you additional capacity to op-
erate the baitwell, washdown, and electronics at
low speed when the charging system output of
the engine is minimal.
The battery selector switch is located in a panel
on the rear of the center console. The switch
feeds the engine and the 12-volt accessory panel.
The engine battery switch is a dual circuit switch
that has three positions, OFF, ON and COMBINE
BATTERIES. When the engine switch is in the ON
position, the engine and accessory circuits are ac-
tivated simultaneously and current flows from the
batteries to the engine, accessories and electron-
ics. The dual circuit feature in the switch allows
the engine battery and circuit to be completely
separate from the accessory (house) battery and
circuit. The COMBINE BATTERIES (EMERGENCY
PARALLEL ONLY) position is highlighted in yellow
and used to temporarily connect both batteries in
parallel to provide additional starting power in the
event of a low or dead engine starting battery.
Once the engine is started, the switch should be
moved to the ON position to isolate the circuits
for normal operation.
The engine charges the battery that feeds it and
the accessory battery through a VSR (voltage
sensitive relay) battery isolator system. The bat-
tery isolator system manages the charging cur-
rent for the 12-volt system whenever the engine
is running. The system automatically senses the
condition of each battery and directs the available
current to the batteries that require charging.
When the engine is started, the engine alternator
starts to recharge the batteries. This charging
current passes through the battery isolator sens-
ing circuit. This circuit senses the charge and it is
split between the batteries, with the lowest battery
receiving the most charge. When the engine is
turned off, the charging stops and the sensing cir-
cuit turns off the VSR, disconnecting the batteries
from the charging circuit, thereby automatically
isolating the batteries from one another.
While in port, while trolling, or at anchor, the
accessory battery will provide current to the boat
accessories and electronics. This will keep the
engine battery in reserve for starting the engine.
The battery switch should be turned to the “OFF”
position when leaving the boat unattended.
Battery Switches, Voltage Sensitive Relays
and Circuit Breakers