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ALTERNATOR AND REGULATOR
8-29
VA
LIGHT SWITCH
VEHICLE
ALTERNATOR
64x474A
Fig. 9-Current
Output Test
(4)
If high resistance is indicated, move the nega-
tive voltmeter lead to each connection along the cir-
cuit towards the battery. A sudden drop in voltage
indicates a loose or corroded connection between that
point and the last point tested. To test the terminals
for tightness, attempt to move the terminal while ob-
serving the voltmeter. Any movement of the meter
pointer indicates looseness.
NOTE: Excessive resistance in the regulator wiring
circuit will cause fluctuation in the ammeter, or a
below normal charge rate.
Field
Current Draw Test (Fig.
81
With tester connections positioned as for the Field
Circuit Resistance Test, observe the test ammeter.
The test ammeter
will
indicate the field current draw.
Refer to "Specifications."
Current Output Test (Fig. 91
(1) With the ignition switch off, disconnect the
field wire from the "FLD" terminal of the alternator
and at the regulator.
(2) Connect a special jumper from the "FLD" ter-
minal of the alternator to one of the test leads of the
tester Field Control.
(3) Connect the other lead of the tester Field Con-
trol to the "BAT" terminal of the alternator.
(4)
Set the Tester Voltage Switch to the 16 VOLT
position.
(5) Connect the positive lead of the test Voltmeter
to the "BAT" terminal of the alternator.
(6)
Connect the negative lead of the Test Voltmeter
to
a
good ground.
(7)
Reconnect the slipon connector at the ignition
ballast resistor.
(8)
Close the BY-PASS Switch of the Battery Post
Adapter.
(9)
With the tester Field Control in the OPEN posi-
tion, start the engine and adjust to 1250 RPM.
(10) Open the BY-PASS Switch of the Battery Post
Adapter.
(11) Rotate the tester Control Knob to the LOAD
position until the Voltmeter reads
6
volts.
(12) Rotate the tester Field Control to the DIRECT
position and adjust the tester Control Knob until the
Voltmeter reads exactly 15 volts.
(13) Observe the test ammeter. Ammeter now in-
dicates maximum output of alternator. The current
output should be within the limits shown in "Specifi-
cations."
NOTE: The current output should
be
within
5
am-
peres of the rated output as there is a total of
5
amperes supplied by the alternator that will not a p
pear on the test ammeter.
This
consists of
1 / 2
am-
pere approximate for the instruments,
11/2
amperes
for the engine ignition system, and
3
amperes for
field current.
If the output is slightly less (5 to
7 amperes) than
that specified above, it may be an indication of possi-
ble "open" rectifier or other alternator internal prob-
lem.
If
the output is considerably lower than that
specified above, it may be an indication of a possible
"shorted" rectifier or other alternator internal prob-
lems. In either case the alternator should be removed
and tested on the bench before disassembly.
(14)
Return the tester Field Control to the OPEN
position.
(15) Return the tester Control Knob to the DIRECT
position.
Insulated Circuit Resistance Test
(Fig. 101
the battery end of positive battery cable.
(1) Connect the negative lead of the Voltmeter to
L IGHT SWITCH
VEHICLE
AMMETER
LTERNATOR
/
I
BALLAST
SWITCH
"ON"
I
FLD.-IGN.
VAT-POD-
REGULATOR
B\TTERY POST
ADAPTER
64x475A
Fig.
I
O - l n s u l a t e d Circuit Resistance lest
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