Instrument Panel And Controls; Charging System Warning Light; Brake System Warning Light - GMC 1975 Motorhome Operating Manual

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INSTRUMENT PANEL AND CONTROLS
SPEEDOMETER AND ODOMETER
The speedometer indicates the forward speed
of the vehicle in miles-per-hour. The odometer
registers the accumulated mileage the vehicle
has been driven. Also, located in the speedome-
ter cluster are the turn signal indicators which
show direction and proper operation of the turn
signals, the high beam indicator light, and the
shift indicator.
FUEL GAUGE
This gauge shows the approximate fuel level
in the main tank when fuel selector switch is in
the "FUEL MAIN" position, and the fuel level
in the auxiliary tank when fuel selector switch
is in the "FUEL AUX" position. The pointer
will indicate the correct positions only when the
ignition is in the "ON" position.
Since both fuel tanks are interconnected, the
indicated level is designed to read the same
(with the switch in either position) until ap-
proximately 60% of the total fuel capacity has
been used. See "Fuel Selector Switch" later in
this section .
TEMPERATURE GAUGE
This gauge registers the temperature of the
engine coolant. The center area of the water
temperature gauge marks the normal operating
range . However, if the needle moves beyond the
center area marks into the "H" side or hot area
of the gauge, stop the engine as soon as possible,
and remain stopped until the cause of the over-
heating is determined.
OIL PRESSURE GAUGE
This gauge registers engine oil pressure . The
consistency of the oil in a cool engine will cause
a high reading when the engine is first started .
As the engine warms, the pressure will recede to
normal . With the engine warmed up to normal
operating temperature, minimum pressure at
idle should be slightly above the "L" graduation
(8 PSI) . At normal operating speeds, minimum
pressure should be between the second and
middle graduations (35 PSI) . Should the pres-
sure drop below these minimums, stop the en-
gine immediately and check the cause of the low
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oil pressure. This could be the result of a danger-
ously low oil level in the crankcase . Driving the
vehicle with low oil pressure can cause extensive
engine damage.
CHARGING SYSTEM WARNING LIGHT
Located to the right of the temperature gauge
is the charging system warning light. A red light
"GEN" will appear with the ignition key in the
"ON" position and the engine not running . This
light lets you know the warning signal is oper-
ational . Should the light fail to come on, see
your MotorHome dealer. When the engine is
started, the warning light should go out and re-
main out. If the light remains on when engine is
running, have your dealer locate and correct the
trouble as soon as possible .
BRAKE SYSTEM WARNING LIGHT
The service brake system is designed so that
half of the brake system will provide some
braking action in the event of a hydraulic leak
in the other half of the system . If the red warn-
ing light, located to the left of the oil pressure
gauge, glows continuously when the engine is
running and after the brakes have been firmly
applied, it may indicate that there is a malfunc-
tion in one part of the brake system.
As a check on bulb condition the light should
glow during engine starting .
Have system repaired if light does not come
on during check.
This warning light is not a substitute for the
visual check of brake fluid level required as
part of normal maintenance.
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Speedometer and Gauge Clusters

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