TM 5-4310-451-14
5-73. ALTERNATOR TESTING AND REPAIR (Con’t).
a. FIELD CURRENT DRAW TEST
1.
Position alternator In test stand as illustrated.
2.
Adjust variable resistance until voltage is 24
volts.
3.
Read field current draw. Reading must be
24.0-28.5 volts and 0.85-0.89 amps. If field
current draw is not within limits, repair alternator.
b. ALTERNATOR OUTPUT TEST
1.
Position alternator in test stand as illustrated.
2.
Connect alternator to test stand driving motor.
3.
Start motor to drive alternator In clockwise
rotation as viewed from drive end.
4.
Close battery switch and adjust carbon pile
rheostat until voltage Is 24.0-28.5 volts.
5.
Slowly increase speed to 1950 rpm. Current
output should be 28.5 volts and 18 amps. If
current output is not as specified, repair
alternator.
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