Alternator.

TM 5-4110-217-14

(2) Insulation Test. Connect ohmmeter or test lamp

5-3. Magneto.

to field terminal and bracket. Resistance should be high

Refer to paragraph 3-43 for testing, removal and

(infinite) or test lamp should not light. If resistance is low

maintenance of the magneto.

or test lamp lights, brush assembly Is shorted and must

be replaced.

5-4. Alternator.

(3) Continuity test. Connect an ohmmeter to field

CAUTION

terminal and insulated brush. Use an alligator clip to

Do not remove alternator from unit

assure good contact to brush.

without first disconnecting the negative ( -

) battery cable.

NOTE

Do not chip brush Resistance reading should

a. Removal. Refer to paragraph 3-46f and remove

be zero Move brush and brush lead wires to

alternator.

make certain that the brush lead wire

b. Brush Assembly Insulation Test (fig. 5-9). (1)

connections are not intermittent. Resistance

Remove two screws (9), brush holder cover (8), and

reading should not vary when brush and wire

brush holder (11).

lead is being moved around

1 Diode, Isolation

9 Screw, self tapping #8

17. Nut, hex, 1024

25. Nut, hex 5/8-18

2. Nut, hex, 10-24

10 Shield, dust

18. Washer, insulator

26 Washer. lock, 5/8

3 Washer, lock, 1/4 inch

11. Brush assembly

19. Insulator, sleeve

27. Key

4. Nut, hex, 1/4-20

12. Bolt. 10-32

20 Stator assemblies

28 Spacer

5. Washer, insulator, #10

13 Nut, square 10-32

21 Retainer, rear bearing

29. Retainer, front bearing

6 Voltage regulator

14. Diode, negative

22 Housing, rear

30. Housing, front

7 Screw, self tapping #10

15. Diode, positive

23 Pulley

31 Bearing, front

8. Cover, brushholder

16. Insulator, sleeve

24 Fan

32 Bearing, rear

33 Rotor assembly

Figure 5-9. Alternator (Model RMP-J/I-1OG)

5-4