Ford COUGAR 1968 Shop Manual page 594

13-8
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GROUP 13
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Charging System
VOLT-AMP-ALTERNATOR TESTER
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FIG. 6
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Alternator Tests
For accurate voltage limiter test-
ing, the battery specific gravity must
be' at least 1.230. If the battery is
low in charge, either charge it to
1.230 specific gravity or substitute a
fully charged battery, before making
a voltage limiter test.
To test the voltage regulator on
the car, make the test connections
to the battery and tester knob adjust-
ments as shown in Fig. 10 Voltage
'
Limiter Test. Turn all accessories off,
including door operated dome lights.
Close the battery adapter switch,
start the engine, then open the adapt-
er switch. Operate the engine at ap-
proximately 2000 rpm for 5 minutes
(use a tachometer Part 9- 1 Section I).
When the battery is charged, the
ammeter should indicate less than 10
amperes with the master control set
at the 114-OH M position.
VOLT-AMP-ALTERNATOR TESTER
Q
Green
Cycle the ,r,egulator as follows:
turn the ignition key to O F F t o s t o p
the engine, close the adapter switch,
start the engine, and open the adapt-
er switch. Increase the engine speed to
2000 rpm. Allow the battery to nor-
malize for about one minute, then
read the voltmeter upper scale. Com-
pare the voltmeter reading with the
voltage given in Fig. 11. If the re-
.
gulated voltage is not within specifi-
cations, replace the regulator.
FIELD OPEN OR SHORT CIRCUIT TEST
JI3S6-C
Field Relay Test
Remove the regulator from the veh-
icle. Make the connections as shown
in Fig. 10 Field Relay Test. Slowlv
rotate the field rheostat knob clockwise
from the maximum counterclockwise
position until the test light comes on.
Observe the voltmeter reading at the
moment that the test light comes on.
This is the relay closing voltage. If
the relay closes immediately, even with
the field rheostat knob close to the
maximum counterclockwise position,
push the red button between the
two meters, and repeat the test. If
the closing voltage is not to speci-
fications, (Part 13-5), replace the re-
gulator.
BATTERY TESTS AND
CONCLUSIONS
Tests are made on a battery to de-
termine the state of charge and also
the condition. The ultimate result of
these tests is to show that the battery
.is good, needs recharging, or must be
replaced.
If a battery has failed, is low in
charge, or requires water frequently,