Symptom Tree t013
| Cause | Correction |
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Electronic fault codes active or high counts of inactive fault codes |
Read the fault codes with an electronic service tool. Refer to Section TF in Troubleshooting and Repair Manual, ISB, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL and QSL9 Engines, CM850 Electronic Control System, Bulletin 4021416 or Troubleshooting and Repair Manual, Electronic Control System, ISC, QSC8.3 and ISL Engines, Bulletin 3666271. |
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Vehicle gauge is malfunctioning |
Check the vehicle gauge. Refer to the OEM service manual. |
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Engine speed too low for charging |
Move throttle to raise engine speed to 1200 rpm to excite the alternator. Refer to the Operation and Maintenance Manual, ISC and ISL Series Engines, Bulletin 4021428 or Operation and Maintenance Manual, QSC8.3 and QSL9 Engines, Bulletin 4021518. |
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Alternator belt is loose |
Check the alternator belt tension. Refer to Procedures 013-001. |
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Electrical system is “open” (blown fuses, broken wires, or loose connections) |
Check the fuses, wires, and connections. Refer to the OEM service manual and the manufacturer’s wiring diagrams. |
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Battery cables or connections are loose, broken, or corroded (excessive resistance) |
Check the battery cables and connections. Refer to Procedure 013-009. |
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Batteries have malfunctioned |
Check the condition of the batteries. Replace the batteries, if necessary. Refer to the OEM service manual. |
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Alternator pulley is loose on the shaft |
Tighten the pulley. Refer to the Operation and Maintenance Manual, ISC and ISL Series Engines, Bulletin 4021428 or Operation and Maintenance Manual, QSC8.3 and QSL9 Engines, Bulletin 4021518. |
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Battery temperature is above specification |
Position the batteries away from heat sources. Refer to the OEM service manual. |
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Alternator noise is excessive |
Refer to Procedure 013-001. |
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Alternator or voltage regulator is malfunctioning |
Test the alternator output. Replace the alternator or voltage regulator if necessary. Refer to Procedure 013-001 and the OEM service manual. |
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Alternator is overloaded, or alternator capacity is below specification |
Install an alternator with a higher capacity. Refer to Procedure 013-001 and the OEM service manual. |
