Windshield Washers; Fuel Selector Switch; Battery Boost Switch; Cigar-Cigarette Lighter - GMC Motor Home Operating Manual

WINDSHIELD WASHERS
The windshield washers are controlled by the
washer switch located under the windshield
wiper lever. To operate the washers, turn the
wipers to an ON position, then push down on
the switch until the desired amount of washer
fluid has been directed to the windshield .
Check washer fluid level regularly - do it
frequently when the weather is bad.
Use a fluid such as GM OPTIKLEEN to
prevent freezing damage, and to provide bet-
ter cleaning .
Do not use radiator anti-freeze in windshield
washer ; it could cause paint damage.
In cold weather, warm the windshield with
defrosters before using washer - to help
prevent icing that may seriously obscure
vision .
FUEL SELECTOR SWITCH
The fuel selector switch, located below the
warning light cluster, has two positions-"FUEL
MAIN" and "FUEL AUX." This switch allows
the driver to change the fuel pick-up and fuel
gauge sending unit from the main tank, as it
goes empty, to the auxiliary tank which will
normally contain 7 to 9 gallons of fuel. It is
recommended that any time the fuel system is
filled, this switch be put in the "FUEL MAIN"
position and left there until auxiliary fuel is
needed.
BATTERY BOOST SWITCH
The GMC Dual Battery System provides
power from two batteries to the Motor Home
12-volt electrical system either in combination
or singularly . The components used to provide
charging and/or switching are conventional, ex-
cept for a diode assembly with which both bat-
teries will receive charging current whenever the
vehicle is running. The diode assembly has sepa-
rate outputs to the two batteries and provides
isolation betwen the batteries and their associ-
ated circuits whenever the engine is not running.
The main battery (or automotive battery)
supplies power to the chassis circuit; i.e., engine,
external lights, etc. The auxiliary battery (liv-
ing area battery) powers the Motor Home living
area ; i.e., internal lights, refrigerator, etc.
2 3
Fuel Tank and Battery Switches
The battery switch should be left in the "BAT
NORMAL" position, except when additional
power is needed for either battery circuit . If this
is desired, change switch to "BAT BOOST" posi-
tion . After use, it is recommended that switch
be returned to the "BAT NORMAL" position .
NOTE :
If the battery boost switch is left in the
"BAT BOOST" position for extended periods
this can result in both batteries being discharged .
The auxiliary (living area) battery will re-
charge itself whenever the motor generator is
running, or whenever your Motor Home is con-
nected to an external power source (see page 30),
in addition to being recharged while the vehicle's
engine is running.
CIGAR-CIGARETTE LIGHTER
Push the lighter in all the way to operate .
When it is heated sufficiently to use, it is de-
signed to "snap" back to normal position with
noticeable sound. Avoid holding the lighter in by
hand while it is heating.
For added safety, the cigar-cigarette lighter
has a heat-sensitive terminal which is designed
to melt and break the circuit if the lighter be-
comes overheated.
HEATING SYSTEM (WITHOUT
AUTOMOTIVE AIR CONDITIONER)
The heating system controls are located on
the instrument panel to the right of the steering
column. There are three separate controls;