Cadillac 54-6219 1954 Shop Manual page 222

11-19
ENGINE ELECTRICAL
the battery in the tester must be charged to at
least 1.250 specific gravity.
The calibration of
the Coil Test Unit will vary slightly with long
periods of use due to normal wearof the point rub
bing block in the breaker assembly. The calibration
should be checked and adjusted, if necessary, at
least twice each year.
IMPORTANT: This
procedure
outlines the
proper method of testing the calibration of the
Coil Test Unit. The calihration 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 scate,using adjust
ment on face of meter,
2. Connect blue ground and red primary leads
together as shown in Fig. 11-22.
3, Turn master switch "ON".
4, Turn switch of the Coil Tester Unit to
"DWELL-OHM" position, and use dwell-OHM regu
lator 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 running,
until
proper reading is obtained.
7. Disconnect test leads and proceed with coil
tests.
c. Coil Heat On or Off the Vehicle
Before testing any coil it should be brought to
operating temperature. If the coil
is on a vehicle
which has been operated for a sufficient period
of
time to bring the coil to normal operating
temperature, the coil does not need additional
heating before testing. If, however, the coil is
not up to temperature, the coil must be heated
with the Coil Heater.
1. Disconnect primary ignition lead at the dis
tributor and remove the high tension lead from the
coil tower.
2, Insert adapter lead in coil tower and connect
coil tester leads as shown in Fig. 11-23.
NOTE: Primary lead may be connected di
rectly to coil primary terminal as shown or
through the ballast resistor on a 12 volt coil.
3. Turn Master switch "ON",
4. Turn Voltage Selector Switch to
position.
5. Turn Selector Switch of the Coil Tester to
"COIL HEAT" position,
6, 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 Secondary Continuity Test on Vehicle
This test is made to determine the condition
of the secondary windings of the coil. A high
reading will indicate an open or high resistance
secondary, while a low reading will indicate a
shorted winding. This test, in addition to the Coil
Capacity Test, is necessary for a thorough test of
the coil condition.
1. Disconnect distributor primary wire,
2. Turn Master switch 'ON",
Fig. 11-22 Calibrating Coil Tester
12 volt
3. Turn the switch of the Coil Tester Unit to
"DWELL-OHM" position.
Fig. 11-23 Heating Coil