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TROUBLESHOOTING & REPAIR | |||
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| ROTOR VOLTAGE TEST (continued) |
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10. If the meter reading indicates battery | ||
voltage, about 12 to 14 VDC, the rotor | ||
may be open, or the brushes may be faulty | ||
or not making proper contact with the slip | ||
rings. Perform the Rotor Resistance Test, | ||
and | Brush and Slip Ring Service | |
Proc dure. |
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11. If the voltage measures about 3 to 5 | ||
VDC, the generator is not | ||
normal output even though the flashing cir- | ||
cuit appears to be functioning normally. | ||
This condition could be caused by one of | ||
several failed components or connections. | ||
Continue with the following test. | ||
12. Check the field bridge rectifier, (D3) and | ||
capacitor (C3); also check the wiring and | ||
terminals connecting them. See the wiring | ||
diagram. |
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13. Perform the Rotor Resistance Test. | ||
14. Perform the | Stator Short Circuit and | |
Ground Test. |
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15. When the Stator short circuit and ground test has been completed, reconnect leads #7 and #9 to the field bridge rectifier, (D3). All other stator leads should remain discon- nected and isolated at this time.
16. Be sure that there are no leads of any kind across any of the stator windings, except the #7 - #9 winding. Examine stator wiring for damage, pinched leads, chafed insula- tion, etc. If necessary, disconnect and iso- late the stator output leads as close to the starter as possible. See wiring diagram.
17. All of these disconnected leads should be insulated, and/or positioned so they cannot come in contact with any other wiring or chassis ground and cannot be damaged by moving parts when the engine is running.
18.
19. If rotor voltage continues to read signifi- cantly lower than 50 VDC, the Stator is probably defective and should be replaced.
Note: The field bridge rectifier and field capac- itor may appear to function normally when test- ed independently, but may malfunction when placed under the stress or normal operation. For this reason, It is recommended that the bridge rectifier and the capacitor be replaced with known good components before replacing the stator.
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