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GM COACH MAINTENANCE MANUAL
Sec. 7
Page 107
WIRING AND MISC. ELEC.
TELL-TALE ALARM SYSTEM
TELL-TALE LIGHTS
Eight tell-tale lights are used on each vehicle
having a standard electrical system.
Seven of
these tell-tales are located on gauge panel in front
of driver, and are visible only when illuminated.
The directional signal tell-tale is located on switch
panel in front of driver (fig. 1). Air conditioning
low oil tell-tale, also shown on switch panel in
figure 1, is used only on vehicles equipped with
air conditioning. Refer to "Alarm and Signal
Wir-
ing Diagram" in back of manual for tell-tale light
circuits.
Following is a list of all standard tell-
tale lights and their function.
1.
"LOW OIL" - This tell-tale indicates that
engine oil pressure has dropped below
3
pounds.
Engine should be stopped immediately and the low
oil condition corrected.
2.
"HOT ENG." - This tell-tale indicates that
temperature of engine is too high for safe opera-
tion.
Engine should be stopped immediately and
the overheated condition corrected.
NOTE: When coach is equipped with
"MOTO-GARD," low oil or hot engine will
cause engine to stop automatically.
There
is, however, a time lag of approximately
25-35 seconds from the time the tell-tale
illuminates
until the engine is stopped.
This provides time to guide vehicle to safe-
ty before the actual stop occurs. Operation
of "MOTO-GARD" system is explained later.
3.
"LOW AIR" - This tell-tale indicates that
air pressure is below 54 to 66 pounds. This pres-
sure will not efficiently operate brakes.
If
vehicle
is moving and tell-tale illuminates, stop vehicle
immediately and correct cause of air pressure
loss.
4.
"EMERG. DOOR" - This tell-tale indicates
that emergency door is open or partially unlatched.
Coach should be stopped and emergency door se-
curely latched for passenger safety.
5.
"NO CHARGE" - This tell-tale indicates
that the generator is not charging, or is not pro-
ducing sufficient output to handle the electrical
load.
6.
"HI BEAM" -
This tell-tale illuminates
when head light high beam is being used.
7.
"STOP LAMP" - This tell-tale illuminates
when brakes are applied to indicate normal func-
tioning of stop lights.
If
tell-tale fails to illumi-
nate when brakes are applied, it is an indication
that one or more stop light bulbs are burned out.
8.
"DIRECT. SIGNAL" - This tell-tale flashes
on and off when directional signals are being used
to indicate normal functioning of signals. If tell-
tale fails to illuminate when directional signal
lever is moved to either right or left turn posi-
tion, it is an indication of burned out directional
signal bulb.
When either of the first four tell-tales listed
above illuminate, a buzzer sounds to audibly warn
the driver that some abnormal condition exists.
Tell-tale alarm system is operative only when
"CONTROL" switch is in "RUN" position, with the
following exception: On some vehicles, the emer-
gency door tell-tale circuit is fed hot, and will
operate whenever ttie emergency door is unlatched
regardless of the position of any other switches.
TELL· TALE ALARM BUZZER
Tell-tale alarm buzzer, rectifier, and rectifier
junction panel are mounted on driver's compart-
ment front trim panel at right of steering column,
below the switch panel (fig. 5). Alarm buzzer is
interconnected with four tell-tale lights as previ-
ously explained under "Tell-Tale Lights" to audi-
bly warn the driver of some abnormal condition.
Vehicle should not be moved while buzzer is sound-
ing.
If buzzer sounds while vehicle is moving,
vehicle should be stopped immediately and the ab-
normal condition corrected. Refer to "Alarm and
Signal Wiring Diagram" in back of manual for
alarm buzzer circuit.
NOTE:
When "CONTROL" switch is
placed in "RUN" position and before the
engine is started, "NO CHARGE," "LOW
OIL," and "LOW AIR" tell-tale lights will
illuminate and the buzzer will sound.
The
tell-tales
will
remain
illuminated
and
buzzer will continue to sound even after
engine has started until oil pressure is
above 3 pounds, air pressure above 54-66
pounds, and generator is charging.
BUZZER MAINTENANCE
Buzzer contact points should be inspected pe-
riodically and cleaned when necessary.
Remove
buzzer cover for access to points.
As a safety precaution, emergency door buzz-
er should be checked daily.
Place engine control
switch in "RUN" position and unlatch emergency
door.
Buzzer should sound.
If
buzzer fails to
sound, test as follows:
1. If buzzer fails to sound with control switch
in "RUN" position and emergency door unlatched,
check for defective circuit breaker (No. 16 on cir-
cuit breaker panel) by connecting a jumper wire
across
circuit
breaker
terminals.
If
buzzer
sounds, circuit breaker is defective and must be
replaced.
If buzzer fails to sound, check circuit
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