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 384 of 1258

TM 9-2320-280-34

Change 1

6 - 4 4 . 1 5

6±-±5±

.±2±

. 400 AMPERE DUAL VOLTAGE ALT±E±R±N±ATOR (12469057) TESTING AND REPAIR (Cont'd)

Table 6-H. No-Load Test.

AMPS

28VDC

14VDC

DIAGNOSIS

322-400

21-25

10.5-12.5

Test bench battery is discharged (or defective).

Allow to charge (or replace).

322-400

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.

322-400

31-35

15.5-17.5

STOP TEST. Regulator and/or tube assembly

must be replaced. Refer to static testing, task c.

160-238

21-25

10.5-12.5

Alternator and/or regulator must be repaired or

replaced. Refer to table 6-K.

160-238

26-30

13-15

Regulator OK. Refer to table 6-I.

160-238

31-35

15.5-17.5

STOP TEST. Bench malfunction or wiring error.