Cadillac 60 Series 1963 Shop Manual page 300

ELECTRICAL SYSTEM
12-19
b. Calibrating Coil Tester
To assure an accurate test of the ignition coil,
the battery in the tester must have a specific
gravity of at least 1.250. The calibration of the
Coil Test Unit will vary slightly with long periods
of use due to normal wear of the point rubbing
block in the breaker assembly.
IMPORTANT: This procedure outlines the
proper method of testing the calibration of the
Coil Test Unit. The calibration of the Unit
should be checked at least twice a year and
more often if in continuous use.
1. Zero meter to left side of scale, using adjust-
ment on face of meter.
2. Connect blue ground and red primary leads
together as shown in Fig. 12-24.
3. Turn master switch "On".
4. Turn switch of Coil Tester Unit to " Dwell -
Ohm" position, and use Dwell-Ohm Regulator to
adjust meter needle to set line.
5. Disconnect leads and connect the primary
leads (red and black) together.
6. Meter now reads the dwell of the Coil
Breaker Unit. It should be 6, plus or minus 1/2
division. If meter does not read within these
limits, remove cover from Coil Breaker Unit and
adjust Tester distributor points, with breaker run-
ning, until proper reading is obtained.
7. Disconnect test leads and proceed with coil
tests.
c. Coil Heat On or Off the Car
Before testing any coil, it should be brought to
to operating temperature. If the coil is on a car
that has been operated for a sufficient period of
time to bring the coil to normal operating tem-
perature, the coil does not need additional heating
before testing. If, however, the coil is not up to
temperature, it must be heated with the Coil
Heater as described below.
Fig. 12-24 Calibrating Coil Tester
Fig. 12-25 Heating the Coil
1. Disconnect primary ignition lead at coil.
2. Remove high tension lead from coil tower and
insert adapter lead.
3. Connect coil tester leads as shown in Fig.
12-25.
4. Turn master switch "On".
5. Turn voltage selector switch to 12-volt posi-
tion.
6. Turn selector switch of Coil Tester to "Coil
Heat" position.
7. Heat coil 6 minutes only.
CAUTION: Do not touch leads while tester is
in "Coil Heat" position. Turn selector switch
to secondary efficiency position before removing
clips.
d. Coil Capacity and
Secondary Continuity Test
These tests are necessary to determine whether
or not the coil is satisfactory for car operation.
1. Disconnect distributor primary wire from
coil, and remove high tension lead from coil.
2. Turn master switch "On".
3. Turn voltage selector switch of Coil Tester
to the 12-volt position.
4. Be sure all lights and accessories are turned
"Off".
5. Turn on ignition switch.
6. Connect tester leads as shown in solid lines,
Fig. 12-26, to include primary circuit in test
circuit.
7. Turn switch of Coil Tester Unit to "Coil
Set" position, and adjust Coil Set Regulator until
meter reads at set point 8.