TM 9-2320-280-34
6-5.2. 400 AMPERE DUAL VOLTAGE ALTERNATOR (12469057) TESTING AND REPAIR (Cont'd)
24.
Perform full-load test. Ensure all load switches are in ON position on test stand, and increase alter-
nator speed to 5000 rpm. Set load to 364 amps/min; record results. Refer to table 6-I, Full-Load
Test, for diagnosis.
25.
Alternator speed and current output tracking values. Refer to table 6-J.
26.
Perform regulator bypass test. Prepare alternator as in full-load test.
NOTE
Perform this test only when instructed from tables 6-H and 6-I.
Use jumper wire rated for 15 amps.
Table 6-K. Regulator Bypass Test.
CONNECT
DISCONNECT
DIAGNOSIS
AMPS RISE
AMPS FALL
Alternator OK. Replace regulator only if low
AMPS (160-238)/low VOLTS (21-25) are indi-
cated in table 6-H and/or table 6-I.
NO CHANGE
NO CHANGE
Alternator must be repaired. Refer to static
testing, task c.
27.
Disconnect alternator connector from regulator. With alternator spinning, use jumper wire and
short pin A to ground momentarily. Record results.
28.
Amperage should rise within 10 percent of rated value with jumper wire connected, and fall with
jumper disconnected. Refer to table 6-K, Regulator Bypass Test, for diagnosis.
29.
Turn test stand master power switch and load switch to OFF.
30.
Disconnect jumper wires from terminals on test stand and alternator.
31.
Remove belt from test stand pulley and alternator pulley. Remove alternator from test stand.
6-44.17
