Cadillac 60 Series 1963 Shop Manual page 345

12-64
ELECTRICAL SYSTEM
2. There is a ground strap integral with the
battery ground strap that is attached to the dust-
shield extension plate to reduce ignition inter-
ference.
3. Two ground cables, one from each of the
upper suspension arms, should be checked for
breaks and proper ground contact.
4. Two ground straps, one from each cylinder
head to cowl, should be checked for breaks and
proper ground contact.
5. A condenser is mounted on the outside of
the coil and may be checked by running engine
at medium speed and then quickly turning ignition
switch to the Accessory position. If the noise
is eliminated, while the engine is coasting to a
stop, replace faulty coil condenser.
c. Regulator Condenser
A condenser is mounted on the regulator to
prevent regulator operation from interfering with
radio reception. A whining sound that increases
in pitch as engine speed is increased is an in-
dication of a faulty regulator condenser. If r e -
placing the regulator condenser fails to eliminate
the whining, the capacitor built into the end
frame of the generator is probably defective
and should be replaced.
83. Minor Adjustments
a. Antenna Trimmer Adjustment
1. Turn radio on and allow it to operate from
two to five minutes to reach normal operating
temperature.
2. Fully extend antenna.
3. Tune in a weak station near 600 KC, on AM
band, and turn volume control to Maximum.
4. Adjust antenna trimmer, located on right
side of receiver unit, for maximum volume.
Access for this adjustment is gained by remov-
ing the glove compartment liner.
NOTE: If, during adjustment, the station be-
comes strong, tune to a weaker station and con-
tinue the adjustment.
b. Push Button Station Selection
1. Unlatch push button by pulling it slightly to
the left and outward.
2. Tune in desired station and then push button
in all the way. Whenever this button is pushed,
the pre-set station will be selected.
3. Repeat above procedure for the four remain-
ing buttons.
84. Minor Repair Procedures
Many conditions that affect radio operation may
be corrected without removing set from car.
Check condition and, using diagnosis chart at end
of section, perform the operation or operations
necessary to correct the condition. If these minor
repairs are not effective, radio should be removed
from car and repaired at an authorized radio
service station.
CAUTION: Do not turn on radio with either
speaker disconnected, as the audio transistor
may be permanently damaged.
a. Fuse
To check condition of fuse, turn radio on and
check operation of radio pilot light. If pilot light
does not light, it is an indication that fuse is
blown. Check fuse and replace with one of correct
amperage. If fuse blows the second time during
signal seeking and return operation on the AM
radio, the radio should be sent out for repairs.
b. Battery
Check battery and make sure that it is fully
charged.
c. Speaker Connections
Check speaker leads for possible open circuit
or ground.
d. Antenna
Use a test antenna and lead-in plugged into the
set with test antenna held outside car. If radio
works satisfactorily with this test assembly, car
antenna should be checked for a short or ground,
and lead-in should be checked for continuity. Test
antenna mast to ground while wiggling antenna.
If a ground is indicated in this test, disassemble
antenna and check for defective insulators or
presence of water or moisture in body tube. Test
with volt-ohm meter from end of either lead-in
tip to ground. If lead-in test shows a ground,
replace lead-in.
The conditions mentioned above will cause a
weak or intermittent signal, and will cause signal
seeker to sweep back and forth across the dial
when tuning bar is depressed while car is in an
unusually weak signal area, such as in a building
or under a viaduct. The mast assembly must be