TM 9-2320-363-20-1
Table 3-1. Troubleshooting (Cont)
Malfunction
Test or inspection
Corrective action
ELECTRICAL SYSTEM (CONT)
Charging Circuits (Cont)
Step 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 no voltage is present,
repair lead 16D (page 3-2).
Step 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 no voltage is present,
replace alternator (page 4-149).
Step 6.
Disconnect lead 123 from line disconnect to twinput voltage regulator. Check
for +24 VDC at lead 123.
If +24 VDC is present, replace twinput voltage regulator
(page 4-158). If no voltage is present, repair lead 123
(page 3-2).
4. +12 VDC CIRCUITS NOT CHARGING, +24 VDC CIRCUITS NORMAL.
Step 1.
Disconnect lead 16E from connector No. 1 on dual voltage control unit.
Check for +12 VDC at dual voltage control unit.
If +12 VDC is present, go to step 2. If no voltage is present,
replace dual voltage control unit (page 4-202).
Step 2.
Disconnect lead 16E from 12 V junction terminal. Check for +12 VDC at
lead 16E.
If +12 VDC is present, repair lead 5 (page 3-2). If no voltage
is present, repair lead 16E (page 3-2).
5. +24 VDC CIRCUITS NOT CHARGING, +12 VDC CIRCUITS NORMAL.
Step 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 no voltage is present,
replace dual voltage control unit (page 4-202).
Step 2.
Disconnect lead 16F from connector on starter motor. Check for +24 VDC at
lead 16F.
If +24 VDC is present, repair lead 1 (page 3-2). If no voltage
is present, repair lead 16F (page 3-2).
3-24
