TM 9-2320-280-34
6-4. 200 AMPERE ALTERNATOR (A0013036AA) TESTING AND REPAIR (Cont'd)
19.
Perform rotor coil ground test as follows:
Set ohmmeter to X10K scale. Connect one probe to a bare metal surface on the rotor shaft.
Insert the second test lead in the housing and contact probe to each of the two slip rings. If a
LOW resistance is noted (less than 50,000 ohms) then the rotor coil is grounded and the
alternator must be replaced.
SLIP RINGS
20.
Perform rotor coil resistance test as follows:
Set ohmmeter to X1 scale and insert the two probes in brush holder opening in the housing.
Connect a probe to each of the two slip rings. Correct resistance is 5.0-6.0 ohms. If resistance
falls outside values shown, then the rotor coil is defective and alternator must be replaced.
NOTE
The stator is the most difficult component to test. If all
components are acceptable, then the stator should be replaced, as
it is most likely to be misdiagnosed as being serviceable.
Perform steps 21 through 28 when disassembling the complete
alternator.
21.
Remove locknut (2), machine key (3), and fan (1) from rotor shaft (4). Discard machine key (3) and
locknut (2).
1
2
3
4
6-29
