GMC Royale - Volt Syste M

used whenever a 120-volt hookup is available t o
reduce the load on your 12-volt battery
. The 12-vol t
system is supplied by batteries and is used whe n
you are on the road or in campsites which do no t
provide 120-volt hookups . Because most component s
in your motor home, such as the water pump, rang e
hood light and fan, interior lights and interior 12-vol t
receptacles, operate only on a 12-volt source, you r
vehicle is equipped with a power converter whic h
changes 120-volt AC to 12-volt DC power .
120-VOLT SYSTE M
The 120-volt system supplies electricity fo r
optional roof air conditioners, the refrigerator ,
power converter for the 12-volt system, the exterio r
120-volt receptacles (Figure 1), and the 120-vol t
receptacles located throughout your motor home ,
which are used to operate regular household appli-
ances
. Whether you use the external 120-volt Shore -
line connection or an auxiliary generator, the powe
r
source is connected directly into the main electrica l
service panel and is distributed through circui t
breakers .
GROUND FAULT INTERRUPTER — The bat h
and exterior receptacles are connected to a Groun
d
Fault Interrupter (GFI)
. This highly-sensitive circui t
breaker will help protect against severe electrica
l
shock if a ground fault develops
. If this occurs ,
the GFI will break the circuit by turning the powe
r
off to those receptacles . Should this happen, unplu
g
all appliances on that circuit and reset the breaker
.
CAUTION
: The GFI does not completel y
eliminate electrical shock
. Small children an d
persons with heart conditions or other disabil-
ities that make them especially sensitive t o
electrical shock may still be injured by a ground
fault on the bath or exterior receptacles
.
Test the GFI system at least once a month
,
preferably before each trip
. Depress the PUSH T O
TEST button . The button will pop out if the circui
t
breaker is operating properly
. Power will be of f
at bath and exterior receptacles
. Plug a test light
into these outlets to verify power is off
. To restor e
power, push in the button .
NOTE
: if the button does not pop out or th e
test light indicates a live circuit, DO NO T
use the outlets
. Call your GMC dealer .
SHORELINE CONNECTION — The Shorelin
e
(Figure 2) is a 25', 30-amp power cord with a 3-pron
g
grounding plug on one end, permanently attached a
t
the other end to the service panel . It can be pulle
d
from its storage compartment through a hatch i
n
the sidewall of your vehicle and connected to a
n
external 120-volt receptacle
. Some campsites an
d
trailer parks still have two-slot receptacles . If it i
s
necessary to use a three-to-two adapter, be certai
n
its grounding wire is fastened securely to the outle
t
grounding screw
. If in doubt, you may attach
a
No
. 6-AWG copper wire to the frame of the vehicl
e
and fasten it to an 8-inch copper or brass stak
e
driven into the ground .
The 120-volt system is protected by the circui
t
breakers
. If a circuit breaker opens, unplug th
e
appliances on that circuit, allow a short period fo
r
the breaker to cool, then reset the breaker . If th
e
breaker continues to open, contact your GMC dealer
.
12-VOLT SYSTE M
The 12-volt system, which includes the automo-
tive and RV batteries (Figures 3 and 4), plus the 12
-
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