GMC 1976 ZEO 6083 Maintenance Manual page 669

2413- 2 LIVING AREA ELECTRICAL
Figure 1-Living Area Electrical Compartment
120-VOLT to 12-VOLT
CONVERTER AND BATTERY
CHARGER
The MotorHome is equipped with a 120-volt to
12-volt power converter rated at 45 amperes. Its
function is to take a portion of the 120-volt current,
that is received when the vehicle is plugged into an
external power source, or when the motor generator
is running and change it to 12-volts which powers
much of the MotorHome. It will also charge the
auxiliary (living area) battery any time 120-volt cur-
rent is being received . The unit is located in the living
area electrical compartment, next to the hall closet .
It should remain plugged at all times.
CAUTION:
Do not use living area electrical
compartment as a storage area. The con-
verter must have a force flow ofair through
and around the unit. Ifair flow is restricted,
the converter could overheat which could
result in malfunction and permanent dam-
age. Do not let the unitget wet, but do keep
it as clean as possible to help assure its long
life . The converter can be cleaned with low
pressure air (?0 PSI maximum) ifnecessary.
The power converter has no moving parts, but
should you suspect that the unit is not functioning
properly, test it in the following manner .
1 . Check the motor generator frequency setting.
It should be 63 cycles at 120 volts no load . The
converter is sensitive to frequency and will not func
tion properly below 60 cycles . If you plan to bench
test the unit, make sure the wall socket is producing
60 cycles . This can also be checked with your fre-
quency meter.
2. Disconnect the converter leads from the
MotorHome. This assures that only the converter is
being checked .
3. Connect the leads to a good, fully charged,
battery and plug in the converter.
4. Using a good calibrated voltmeter, read output
voltage across the battery. It should be between 13
to 15 volts.
Converter humming is not considered to be a
failure. Humming should be corrected by installing
mounting pads .
WATER HEATER SWITCH
An "ON OFF" switch for the water heater is
located in the living area electrical compartment.
The switch is located in this compartment to prevent
the possible hazard of operating the switch with wet
hands; i .e ., trying to operate the switch after starting
to wash or shower .
CAUTION:
Do not operate water heater un-
less there is water in the living area water
system. If unit is operated without water
this will result in damage to the heating
element.
NOTE : For details on the water heater, refer to
Living Area Water System, Section 24J.