TM 9-2320-280-34
6-5. 200 AMPERE ALTERNATOR (12338796-1) TESTING AND REPAIR (Cont'd)
NOTE
When tachometer reaches 3000 rpm, green lamp should go off
indicating proper charging from alternator.
"Normal" voltage range is 26-30 VDC. "High" amperage is 10%
over the rated alternator output of 182 amps (@ 5000 rpm).
7.
Perform no-load test. Increase alternator speed to 5000 rpm; record results. Refer to table 6-A.7,
No-Load Test, for diagnosis.
8.
Perform full-load test. Set all load switches on 500 amp test stand to "ON" and increase alternator
speed to 5000 rpm. Set load to 182 amps min.; record results. Refer to table 6-B, Full-Load Test, for
diagnosis.
Table 6-A.7. No-Load Test.
AMPS
VOLTS
DIAGNOSIS
161-200
21-25
Test bench battery is discharged (or
defective). Allow to charge (or replace).
161-200
26-30
Give time to stabilize while monitoring
VOLTS. If VOLTS rise above normal range
(26-30 volts), regulator and/or tube
assembly must be replaced. If AMPS fall,
charging systems OK.
161-200
31-35
STOP TEST. Regulator and/or tube
assembly must be replaced. Refer to Static
Testing.
80-119
21-25
Alternator and/or regulator must be
repaired or replaced. Refer to table 6-C.
80-119
26-30
Regulator OK. Refer to table 6-B.
80-119
31-35
STOP TEST. Bench malfunction or wiring
error.
Table 6-B. Full-Load Test.
AMPS
VOLTS
DIAGNOSIS
161-200
21-25
Test bench battery is discharged (or
defective). Allow to charge (or replace).
161-200
26-30
Charging system OK.
161-200
31-35
STOP TEST. Regulator and/or tube
assembly must be replaced. Refer to Static
Testing.
80-119
21-25
Alternator and/or regulator must be
replaced. Refer to table 6-C.
80-119
26-30
Increase load.
80-119
31-35
STOP TEST. Test bench malfunction or
wiring error.
Change 1
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