TM 9-2320-280-34
6-5.1. 200 AMPERE DUAL VOLTAGE ALTERNATOR (12447109) TESTING AND REPAIR (Cont'd)
Table 6-F. Alternator Speed and Current Tracking.
ALTERNATOR
28 VDC
14 VDC
ALTERNATOR
28 VDC
14 VDC
SPEED
OUTPUT CURRENT
OUTPUT CURRENT
SPEED
OUTPUT CURRENT
OUTPUT CURRENT
(RPM)
5 AMP
MINIMUM AMP
(RPM)
5 AMP
MINIMUM AMP
*0
26
2000
120
12
4
33
132
0
1,200
20
17
8
23
30
7
110
50
**37
0
3000
130
30
*6
40
150
10
50
40
160
8q
1,500
60
30
*0
8
74
16
5000
8
10
**90
0
to
140
40
*0
20
8000
165
25
2,000
8
40
180
10
90
42
190
0
105
27
* Dependent on ammeter location in test circuit.
** Minimum acceptable current with no load on 28 VDC system.
11.
Perform regulator bypass test. Prepare alternator as in full-load test.
NOTE
Perform this test only when instructed from tables 6-D and 6-E.
Use jumper wire rated for 15 amps.
12.
Disconnect alternator connector from regulator. With alternator spinning, use jumper wire and
short pin A to ground momentarily. Record results.
13.
Amperage should rise within 10 percent of rated value with jumper wire connected, and fall with
jumper disconnected. Refer to table 6-G for diagnosis.
14.
Turn test stand master power switch and load switch to OFF.
15.
Disconnect jumper wires from terminals on test stand and alternator.
16.
Remove belt from test stand pulley and alternator pulley. Remove alternator from test stand.
Table 6-G. Regulator Bypass Test.
CONNECT
DISCONNECT
DIAGNOSIS
AMPS RISE
AMPS FALL
Alternator OK. See note. Replace regulator
only if low AMPS (40-59)/low VOLTS (21-25)
are indicated in table 6-D and/or table 6-E.
NO CHANGE
NO CHANGE
Alternator must be repaired. Refer to static
testing, task c.
6-44.5
