ELECTRICAL SYSTEM
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Typical rotary master battery
switch. Some motorhomes are
equipped with a rocker-style
master battery switch.
The master battery switch
is typically located just
inside the motorhome's
main entrance. It is used
to connect power from the
auxiliary (house) battery(ies)
to the motorhome’s 12-volt
DC electrical fuse panel,
hereby providing power to
the motorhome's interior
lighting and other 12-volt
DC devices. Although the
style of this switch may be
a rocker-type or a rotary
switch, the function remains
the same.
• When the switch is in the ON position, the auxiliary
(house) batteries are connected to 12-volt devices that
are powered through the 12-volt fuse panel.
• When the switch is in the OFF position, the auxiliary
(house) batteries are disconnected from the 12-volt
fuse panel.
With rocker-style master battery switches, power connection
to the 12-volt fuse panel is accomplished through a battery
relay, which is controlled by the master battery switch. e
battery relay is located in the battery compartment and can
be identied by the direct connection of the positive battery
cables to it.
When connected to 120-volt shore power or the on-board
generator is being used, the 12-volt system is powered
through the converter, therefore, the master battery switch
is not controlling 12-volt system power. However, when con-
nected to shore power or operating the on-board generator,
Master Battery Switch
Typical Class A
motorhome auxiliary
(house) battery
compartment
Typical Class C motorhome auxiliary battery location (under entrance
step)
Turning the Master Battery Switch OFF does not totally
isolate the battery from the entire 12-volt system.
Some devices, such as the solar charge controller, are
connected directly to the battery. Use caution when
performing maintenance on the 12-volt system of your
motorhome.
CAUTION
When traveling, the master battery switch must be turned
ON to operate the dash radio and backup camera system
(if equipped).
NOTICE
Controlling Battery Power
ere are several devices of the electrical system that are
designed to control power to and from the motorhome's
house and chassis batteries. Battery power management is
important in order to:
• Turn the 12-volt electrical power ON and OFF;
• Charge the house and chassis batteries;
• Manage battery power output;
• Monitor battery charge condition.
Following, is a brief description of the electrical devices
used to control the 12-volt power system of the motorhome.
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