Symptom Tree t014
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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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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Battery cell is damaged (open circuit) |
Check the condition of the batteries. Replace the batteries, if necessary. Refer to the OEM service manual. |
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Voltage regulator is malfunctioning |
Check the voltage regulator. Replace the voltage regulator, if necessary. Refer to the OEM service manual. |
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Battery isolator failed (if equipped) |
Refer to boat manufacturer’s specification and wiring. |
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Alternator is malfunctioning |
Test the alternator output. Refer to Procedure 013-001 or the OEM service manual if a non-Cummins alternator. |