Buick LeSabre 1965 Service Manual page 636

1 0 - 6 6 ELECTRIC CLOCK ELECTRICAL SYSTEMS
is high enough so that the heater
can be turned on and be effective.
The car should never be subjected
to full throttle accelerations or
high speeds until after the "Cold"
light has gone out.
If the engine cooling system is
not functioning properly and the
water temperature should reach
approximately 248 degrees F., the
"Hot" indicator will be turned on
by the temperature switch. As a
test circuit to check whether the
"Hot" indicator bulb is function-
ing properly, a wire which is con-
nected to the "GND" terminal of
the ignition switch is tapped in
to its circuit. See Figure 10-65
or 66. When the ignition is in the
"Start" position (engine crank-
ing), the "GND" terminal is
grounded inside the switch and
the "Hot" indicator bulb will be
lit. When the engine is started
and the ignition switch is in the
"On" position, the test circuit
is opened and the bulb is then
controlled by the temperature
switch.
f. Trouble Diagnosis—Generator
Indicator, Oil Indicator, Pres-
sure Temperature Indicator
Use Figure 10-65 or 66 to trace
w i r i n g circuits for indicator
lights. To determine if there is
a ground in the indicator light
circuit, remove connector from
control switch, if light stays on,
trouble is in circuit.
1 0 - 4 9 ELECTRIC CLOCK
The electric clock is mounted in
the center of the instrument clus-
ter. The clock wiring circuit is
protected by the "CLOCK" fuse
on the fuse block. The clock light
is controlled by the rheostat in
the lighting switch and is pro-
tected by the "INST. LTS." fuse
on the fuse block.
Figure 10-67—Electric Clock
a. Clock Time Reset and
Automatic Regulation
The electric clock has a sweep-
second hand and an automatic
regulator. A reset knob extends
through the glass at the bottom of
the clock dial. To reset the time,
pull the knob out and turn in
either direction as required. See
Figure 10-67 or 68.
There is no regulator knob be-
cause regulation is accomplished
automatically by the action of re-
setting the time. If a clock is
running fast, the action of turning
the hands back to correct the
tinie will automatically cause the
clock to run slightly slower; if a
clock is running slow, the action
of turning the hands forward to
correct the time will automati-
cally cause the c l o c k to run
slightly faster (10 to 15 seconds
per day).
Figure 10-68—Electric Clock - Riviera
A lock-out feature prevents the
regulator mechanism from being
moved more than once during a
rewind period (approximately 3
minutes), regardless of the num-
ber of times the clock reset is
operated. After clock rewinds, if
it is again reset, automatic regu-
lation will take place.
b. Clock Service
The clock manufacturers have es-
tablished A u t h o r i z e d Service
Stations in many cities throughout
the United States and Canada.
These service stations are pre-
pared to carry out terms of the
manufacturer's warranty and also
to perform any repairs made nec-
essary through use of clock.
When a clock requires warranty
service or r e p a i r s other than
regulation, it should be removed
by the Buick dealer and sent to
the nearest authorized service
station. The manufacturer's war-
ranty is void if repairs have been
attempted outside of an authorized
service station.
1 0 - 5 0 GASOLINE GAUGE
SYSTEM—DESCRIP-
TION AND
OPERATION
The gasoline gauge system con-
sists of a dash unit (located in
the instrument cluster), a tank
unit (located in the gasoline tank),
a wire between these two units,
and a wire to supply battery volt-
age to the dash unit. See Figure
10-70. The s i n g l e tank unit
terminal is connected to one dash
unit terminal with a tan wire.
The other dash unit terminal is
connected to the ignition switch
with a pink wire so that voltage
to energize the system is supplied
only when the ignition switch is
turned on. The dash unit has a
balanced-type pointer; when the
ignition is turned off, the pointer
may come to rest any place on
the dial.