Operation and maintenance manual

QSB4.5 and QSB6.7 Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms Page TS-9
Alternator Not Charging or Insufficient Charging
Cause Correction
STEP 1
Alternator pulley is loose on the shaft
............. Tighten the pulley. Refer to OEM service manual.
OK
Go To Next Step
STEP 2
Batteries have malfunctioned
.............
Check the condition of the batteries. Replace the
batteries, if necessary. Refer to OEM service
manual.
OK
Go To Next Step
STEP 3
Battery cables or connections are loose, broken, or
corroded (excessive resistance)
............. Check the battery cables and connections.
OK
Go To Next Step
STEP 4
Alternator is overloaded, or alternator capacity is
below specification
.............
Install an alternator with a higher capacity. Refer to
the OEM service manual.
OK
Go To Next Step
STEP 5
Alternator or voltage regulator is malfunctioning
.............
Test the alternator output. Replace the alternator
or voltage regulator if necessary. Refer to the OEM
service manual.
OK
Go To Next Step
STEP 6
Battery temperature is above specification
.............
Position the batteries away from heat sources.
Refer to the OEM service manual.
OK
Go To Next Step
STEP 7
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 diagram.
OK
Go To Next Step
STEP 8
Vehicle gauge is malfunctioning
.............
Check the vehicle gauge. Refer to the OEM
service manual.
OK
Go To Next Step
STEP 9
Contact a Cummins® Authorized Repair Facility