TM-9-2320-387-24-2
TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE, VOLUME 2
DECEMBER 1997
CHANGE 1
TM-9-2320-387-24-2 - Page 686 of 1555
Th49-2320-387-24-2
18-3. ILOO-AMPERE DUAL VOLTAGE ALTERNATOR TESTING AND REPAIR (Cont’d)
NOTE
l
When
tachometer reaches 3,000 rpm, green lamp should go off
indicating proper charging from alternator.
l
Normal voltage range is 26-30 VDC. High amperage is +lO percent
over the rated alternator output of 182 amps at 5,000 rpm.
10.
Perform no-load test. Increase alternator speed to 5,000 rpm; record results. Refer to table 18-1 for
diagnosis.
11.
Perform full-load test. Ensure all load switches are in ON position on 500-amp test stand, and
increase alternator speed to 5,000 rpm. Set load to 182 amps/mm, record results. Refer to table 18-2
for diagnosis.
Table 18-1. No-Load Test.
AhdPS(28v)
28V
VOLTS
14v
161-200
21-25
10.5-12.5
161-200
26-30
13-15
161-200
31-35
15.5-17.5
80-119
21-25
10.5-12.5
80-119
26-30
13-15
80-119
31-35
15.5-17.5
IPS
(28V)
161-200
28V
VOLTS
14v
!
DIAGNOSIS
21-25
10.5-12.5
161-200
26-30
13-15
161-200
31-35
15.5-17.5
80-119
21-25
10.5-12.5
80-119
26-30
13-15
80-119
31-35
15.5-17.5
C
DIAGNOSIS
Test bench battery is discharged (or
defective). Allow to charge (or replace).
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 systems OK
STOP TEST. Regulator and/or tube
assembly must be replaced. Refer
to
static
testing, task c.
Alternator and/or regulator must be
repaired or replaced. Refer to table 18-3.
Regulator OK Refer to table 18-2.
STOP TEST. Bench malfunction or wiring
error.
Table 18-2. FullLoad
Test.
‘Ikst bench battery is discharged (or
defective). Allow to charge (or replace).
Charging system OK
STOP TEST. Regulator and/or tube
assembly must be replaced. Refer to static
testing, task c.
Alternator and/or regulator must be
replaced. Refer to table 18-4.
Increase load.
STOP TEST. Test bench malfunction or
wiring error.
18-4
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