ARMY TM 9-6115-641-24
AIR FORCE TO 35C2-3-456-12
4-10-4. Testing Brushless Exciter Stator. - Continued.
1 + and F2 exciter stator leads to terminal block in generator end bell.
Install end bell cover on generator, paragraph 411-4, step n (MEP-802A) or paragraph 412-5, step g
Connect negative battery cable and close access doors.
Figure 4-18. Testing Exciter Field
4-10-5. Testing Brushless Exciter Rotor (Armature). Using resistance bridge and multimeter, set for ohms, test the
brushless exciter rotor (Figure 4-19) for open or shorted windings and grounds as follows:
Figure 4-19. Testing Exciter Armature
Shut down generator set. Allow generator to cool to ambient temperature.
Open left side engine access door and disconnect negative battery cable.
Open storage box and output terminal board access doors.
Remove end bell cover from generator, paragraph 4111, step e (MEP-802A) or paragraph 4-12-2, step h
Tag and disconnect lead wires from diodes CRI, CR2, CR3, CR4, CR5, and CR6 on rotating rectifier.
Connect resistance bridge between leads CR1 and CR2, CR2 and CR3, CR1 and CR3, CR4 and CR5, CR4
and CR6, and CR5 and CR6. Resistance between leads should be as shown in Table 4-1.
Readings other than shown in Table 4-1 indicate open or shorted windings and exciter rotor must be replaced.
Connect leads of multimeter between each CR lead and exciter rotor lamination. Multimeter reading less than
infinity indicates defective ground insulation and exciter rotor must be replaced.
Connect exciter rotor lead wires to diodes CR1, CR2, CR3, CR4, CR5, and CR6. lighten nuts to 24 inlbs (2.7
Nm) and remove tags.