TM 9-2320-280-34
6-3.3. 100 AMPERE DUAL VOLTAGE AL ERNATOR (12447110) TESTING AND REPAIR (Cont'd)
T
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 percent
over the rated alternator output of 81 amps at 5000 rpm.
9.
Perform full-load test. Ensure all load switches are in ON position on 500-amp test stand, and
increase alternator speed to 5000 rpm. Set load to 81 amps/min; record results. Refer to table 6-A.4,
Full-Load Test, for diagnosis.
Table 6-A.3. No-Load Test.
AMPS
28 VDC
14 VDC
DIAGNOSIS
81-100
21-25
10.5-12.5
Test bench battery is discharged (or defective).
Allow to charge (or replace).
81-100
26-30
13-15
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 system is OK.
81-100
31-35
15.5-17.5
STOP TEST. Regulator and/or tube assembly must
be replaced. Refer to static testing, task c.
40-59
21-25
10.5-12.5
Alternator and/or regulator must be repaired or
replaced. Refer to table 6-A.6.
40-59
26-30
13-15
Regulator OK. Refer to table 6-A.4.
40-59
31-35
15.5-17.5
STOP TEST. Test bench malfunction or wiring error.
Table 6-A.4. Full-Load Test.
AMPS
28 VDC
14 VDC
DIAGNOSIS
81-100
21-25
10.5-12.5
Test bench battery is discharged (or defective).
Allow to charge (or replace).
81-100
26-30
13-15
Charging system OK.
81-100
31-35
15.5-17.5
STOP TEST. Regulator and/or tube assembly
must be replaced. Refer to static testing, task c.
40-59
21-25
10.5-12.5
Alternator and/or regulator must be replaced.
Refer to table 6-A.6.
40-59
26-30
13-15
Increase load.
40-59
31-35
15.5-17.5
STOP TEST. Test bench malfunction or wiring
error.
6-18.32
Change 1
