TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 324 of 1258
6 - 3 . 2 . 100 AMPERE ALT E R N ATOR (12342944) TESTING AND REPAIR (Cont’d)
8.
Regulator Bypass Test.
NOT E
Perform this test only when instructed from tables 6-A and 6-A.1.
(a) Prepare alternator as in Full-Load Test.
NOT E
Use jumper wire rated for 15 amps.
(b) Disconnect alternator connector from regulator. With alternator spinning, use jumper wire and
short pin A of connector to ground momentarily. Record results.
(c) Amperage should rise within ± 10% of rated output with jumper wire connected and fall with
jumper disconnected. Refer to table 6-A.2 for diagnosis.
9.
Turn test stand master power switch and load switch to OFF.
10.
Disconnect jumper wires from terminals on test stand and alternator.
11.
Remove V-belt from test stand pulley and alternator pulley. Remove alternator from test stand.
CONNECT
DISCONNECT
DIAGNOSIS
AMPS RISE
AMPS FALL
Alternator OK. See note. Replace regulator
only if low AMPS/low VOLTS
are indicated
in table 6-A and/or table 6-A.1.
NO CHANGE
NO CHANGE
Alternator must be repaired. Refer to Static
Testing.
Table 6-A.2. Regulator Bypass Test.
TM 9-2320-280-34
Change 1
6 - 1 8 . 1 9
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