TM 9-2320-387-24-2
1 18-3. 2004MPERE DUAL VOLTAGE ALTERNATOR TESTING AND REPAIR (Cont’d)
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12.
Alternator speed and current output tracking values. Refer to table 18-3.
Table 18-3. Alternator
Speed and Current
Dacking.
ALTERNATOR
28VDC
14vDc
ALTERNATOR _
28vDc
14vDc
SPEED
OUTPUT
CURRENT
OUTPUT
CURRENT
SPEED
OUTPUT
CURRENT
OUTPUT
CURRENT
(RPM)
k5AMP
MINIMUM
AMP
(RPM)
+5 AMP
MINIMUM
AMP
*0
34
105
27
4
33
2,000
120
12
1,200
20
17
**132
0
30
7
*0
23
**37
0
14
50
*0
40
3,000
110
50
6
50
130
30
1,500
50
40
150
10
**160
60
0
30
*0
10
74
16
5,000
15
50
**go
0
TO
140
50
*0.
31
8,000
165
25
2,000
8
50
180
10
90
42
**190
0
* Dependant on ammeter location in test circut.
** Minimum acceptable current with no load on 14 VDC system.
13.
Perform regulator bypass test. Prepare alternator as in full-load test.
NOTE
l Perform this test only when instructed from tables 18-1 and 18-2.
l Use jumper wire rated for 15 amps.
14.
Disconnect alternator connector from regulator. With alternator spinning, use jumper wire and
short pin A to ground momentarily. Record results.
15.
Amperage should rise within f 10 percent of rated value with jumper wire connected, and fall with
jumper disconnected. Refer to table 18-4 for diagnosis.
16.
Turn test stand master power switch and load switch to OFF.
17.
Disconnect jumper wires from terminals on test stand and alternator.
18.
Remove belt from test stand pulley and alternator pulley. Remove alternator from test stand.
Table 18-4. Regula or Bypass Test.
CONNECT
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DISCONNECT
DIAGNOSIS
-7
AMPS RISE
AMPS FALL
NO CHANGE
NO CHANGE
Alternator OK See note. Replace regulator
only if low AMPS
(80-119YIow VOLTS (21-25)
are indicated in table 18-1 and/or table 18-2.
Alternator must be repaired. Refer to static
testing, task c.
18-S
