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8-30
ALTERNATOR AND REGULATOR
(2)
Set the Voltage Switch to 2 VOLT position.
(3) Adjust the Field Control until the tester am-
meter reads exactly 10 amperes.
(4)
Observe the Voltmeter reading. Voltmeter now
indicates the amount of voltage loss across the insu-
lated circuit. The voltage loss should not exceed .3
volt. If
a higher voltage loss is indicated, inspect,
clean and tighten all the connections in the charging
circuit. A voltage loss test may be performed at each
connection to locate the connection that has excessive
resistance.
Ground Circuit Resistunce Test
(Fig.
I l l
(1) Connect the positive lead of the test Voltmeter
to the negative terminal of the battery.
(2) Connect the negative lead of the test Voltmeter
to
a good ground on the alternator.
(3) With the alternator charging 10 amps, observe
the Voltmeter reading. Voltmeter now indicates the
amount of voltage loss across the ground circuit. The
voltage loss should not exceed
.3
volt.
(4)
Rotate the tester Field Control to the OPEN
position.
Voltuge Regulator Test (Fig.
121
NOTE:
Regulator temperature should
be
normal-
ized by operating with a
10 ampere load for 15 min-
utes just prior to testing.
Upper Contucts Test
(1) Remove the
test
lead of the tester Field Control
from the "BAT" terminal of the alternator and con-
nect to the field wire disconnected from the regulator.
(2) 'Set the Voltage Switch to the 16 VOLT position.
(3) Connect the positive lead of the Voltmeter to
(4)
Rotate the tester Field Control to the DIRECT
the "BAT" terminal of the alternator.
LIGHT SWITCH
VEHICLE
VA
REGULATOR
64x476A
Fig.
7
I - G r o u n d Circuit Resistance Test
position.
(5) With the engine operating at 1250 RPM, rotate
the tester Control Knob clockwise until the Ammeter
reads exactly 15 amperes.
(6) Rotate the tester Field Control from the DI-
RECT position to the OPEN position and then back
to the DIRECT position to cycle the system.
(7) Observe the test voltmeter. The voltmeter now
indicates the setting of the voltage regulator upper
contacts. Refer to "Specifications."
(8)
Rotate the tester Control Knob to the DIRECT
position. If the regulator operates within specifica-
tions, proceed to the lower contact voltage test. If the
upper contact voltage setting is not within specifica-
tions, remove the regulator cover and adjust the volt-
age setting as outlined in "Regulator Adjustments"
test number (1).
Lower Contacts Test
(1) Increase the engine speed to 2200 RPM.
(2) Rotate the tester Control Knob to the
3 4
OHM
position only
if
the tester Ammeter reads over 5 am-
peres.
(3)
Rotate the tester Field Control from the DI-
RECT position to the OPEN position and then back
to the DIRECT position to cycle the system.
(4)
Observe the voltmeter. Voltmeter now indicates
setting of the voltage regulator lower contacts. Refer
to specifications.
Voltage should increase not less than .2 volt or
more than .7 volt above the previous operating volt-
age setting recorded in the upper contact set. A volt-
age reading of less than .2 volt or more than
.7
volt
is an indication of a possible wrong air gap setting,
refer to "Regulator Mechanical Adjustments."
(5) Rotate the tester Field Control to the OPEN
position and the Control Knob to the DIRECT posi-
tion.
LIGHT SWITCH
VEHICLE
V
ADAPTER
64x477A
Fig. 72-Voltage
Regulator lest
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