Troubleshooting Electrical System Using Abbreviated Procedures
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| ELECTRICAL SYSTEM TROUBLESHOOTING | ||
|---|---|---|
| FAULT DESCRIPTION | RESULT OF FAULT (“during normal operation”). | POSSIBLE CAUSES |
| System voltage is high. | 1. Category warning I - (“Voltage over 29.5V”). | 1. Faulty alternator (“voltage regulator”) |
| System voltage is too high. | 1. Category III warning - (“Voltage over 32.0V”) | 1. Faulty alternator (“voltage regulator”) |
| System voltage is low. | 1. Category I warning - (“Voltage below 24.8V”) | 1. Idling over 30 minutes with all electronic loads
2. The alternator belt is slipping. 3. The “pulley drive nut ”of the alternator is loose. 4. Engine low idle speed is too low. 5. The electrical loads are too high for the alternator output . 6. Faulty battery(ies) 7. Faulty alternator 8. The wrong alternator is being used. The capacity is too low. 9. Battery wiring is shorted to the frame. |
| System voltage is too low. | 1. Category III warning - (“Voltage is below 23.0 VDC”)
2. Dim headlights 3. Possible loss of some electrical controls |
1. Idling over 30 minutes with all electronic loads
2. The alternator belt is slipping. 3. The “pulley drive nut ”of the alternator is loose. 4. Engine low idle speed is too low. 5. The electrical loads are too high for the alternator output . 6. Faulty battery(ies) 7. Faulty alternator 8. The wrong alternator is being used. The capacity is too low. 9. Battery wiring is shorted to the frame. |
| FAULT DESCRIPTION | RESULT OF FAULT (“during normal operation”). | POSSIBLE CAUSE |
| “CAB DISPLAY ERROR” | ||
| 1. The message center shows “CAB DISPLAY ERR”.
2. The display modules may not work during normal operation and self-test operation. 3. The display modules may function erratically during operation or self-test operation. 4. The display modules now appear to work normally. |
1. The harness is open or shorted in one or more of the following circuits that are listed here.
A. E707-GN(Green) (“9 VDC Power”) B. E708-PK(Pink) (Clock) C. C413-YL(Yellow) (Data) D. C414-BU(Blue) (Load) 2. Wire E972-BU(Blue) is open or intermittent. 3. One or more of the display modules are faulty. 4. The main module is faulty. |
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