TM 9-2320-302-20
0010 00-2
Table 1. Electrical System Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Charging Circuits
1. Batteries Not Charging, Voltmeter Does Not
Indicate Voltage.
1. Disconnect
lead
83
from
negative
(-)
terminal
or
alternator.
Check
for
continuity between lead 83 and
ground.
If continuity is indicated, go to
step
2.
If
continuity
is
not
indicated, repair lead 83 (WP
0119 00).
2. Check for continuity between
negative
(-)
terminal
and
negative field (F-) terminal or
alternator.
If continuity is indicated, go to
step
3.
If
continuity
is
not
indicated, replace alternator (WP
0055 00).
3. Disconnect lead 16D from
positive
(+)
terminal
or
alternator. Check for +24 VDC
at positive (+) terminal or
alternator.
If +24 VDC is present, go to step
4. If voltage is not present, replace
alternator (WP 0055 00).
4. Disconnect lead 16D from
dual
voltage
control
unit.
Check for +24 VDC at lead
16D.
If +24 VDC is present, go to step
5. If voltage is not present, repair
lead 16D (WP 0119 00).
5. Disconnect lead 123 from
positive field (F+) connector
on alternator. Check for +24
VDC at positive field (F+)
connector.
If +24 VDC is present, go to step
6. If voltage is not present, replace
alternator (WP 0055 00).
6. Disconnect lead 123 from
twinput
voltage
regulator.
Check for +24 VDC at lead
123.
If +24 VDC is present, replace
twinput voltage regulator (WP
0057 00). If voltage is not present,
repair lead 123 (WP 0119 00).
2. +12 VDC Circuits Not Charging, +24 VDC
Circuits Normal.
1. Disconnect lead 16E from
connector no.1 on dual voltage
control unit. Check for +12
VDC at dual voltage control
unit.
If +12VDC is present, go to step 2.
If voltage is not present, replace
dual voltage control unit (WP
0058 00).
2. Disconnect lead 16E from 12V
junction terminal. Check for
+12 VDC at lead 16E.
If +12 VDC is present, repair lead
5. If voltage is not present, repair
lead 16E (WP 0119 00).
3. +24 VDC Circuits Not Charging, +12 VDC
Circuits Normal.
1. Disconnect lead 16F from
connector
no.
2
on
dual
voltage control unit. Check for
+24 VDC at dual voltage
control unit.
If +24 VDC is present, go to step
2. If voltage is not present, replace
dual voltage control unit (WP
0058 00).
2. Disconnect lead 16F from
connector at starter motor.
Check for +24 VDC at lead
16F.
If +24 VDC is present, repair lead
1. If voltage is not present, repair
lead 16F (WP 0119 00).
