TM 9-2320-280-34
6-5.1. 200 AMPERE DUAL VOLTAGE ALTERNATOR (12447109) 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 percent
over the rated alternator output of 162 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-E,
Full-Load Test, for diagnosis.
10.
For alternator speed and current output tracking values, refer to table 6-F.
11.
Perform regulator bypass test. Prepare alternator as in full-load test.
Table 6-D. No-Load Test.
AMPS
28VDC
14VDC
DIAGNOSIS
162-200
21-25
10.5-12.5
Test bench battery is discharged (or defective). Allow
to charge (or replace).
162-200
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.
162-200
31-35
15.5-17.5
STOP TEST. Regulator and/or tube assembly must be
replaced. Refer to static testing, task c.
80-118
21-25
10.5-12.5
Alternator and/or regulator must be repaired or
replaced. Refer to table 6-F.
80-118
26-30
13-15
Regulator OK. Refer to table 6-E.
80-118
31-35
15.5-17.5
STOP TEST. Test bench malfunction or wiring error.
Table 6-E. Full-Load Test.
AMPS
28VDC
14VDC
DIAGNOSIS
162-200
21-25
10.5-12.5
Test bench battery is discharged (or defective).
Allow to charge (or replace).
162-200
26-30
13-15
Charging system OK.
162-200
31-35
15.5-17.5
STOP TEST. Regulator and/or tube assembly
must be replaced. Refer to static testing, task c.
80-118
21-25
10.5-12.5
Alternator and/or regulator must be replaced.
Refer to table 6-G.
80-118
26-30
13-15
Increase load.
80-118
31-35
15.5-17.5
STOP TEST. Test bench malfunction or wiring
error.
6-44.4
Change 1
