TM 9-2320-280-34
6-3.3. 100 AMPERE DUAL VOLTAGE ALTERNATOR (12447110) TESTING AND REPAIR (Cont'd)
10.
Alternator speed and current output tracking values. Refer to table 6-A.5.
Table 6-A.5. 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
25
36
10
31
2000
38
43
1,200
25
23
52
33
35
13
65
20
48
0
**85
0
*0
23
*0
8
15
34
4000
25
32
1,500
32
37
to
48
52
55
14
8000
70
30
69
0
87
13
2,000
*0
20
**100
0
* 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-A.3 and 6-
A.4.
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-A.6, Regulator Bypass Test, 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-A.6. 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-A.3 and/or table 6-A.4.
NO CHANGE
NO CHANGE
Alternator must be repaired. Refer to static
testing, task c.
6-18.33
