Vehicle gauge is malfunctioning
Check the vehicle gauge. Refer to the OEM service manual.
Engine speed too low for charging
Move throttle to raise engine speed to 1200 rpm to excite the alternator. Refer to the corresponding Owners Manual and/or Operation and Maintenance Manual for the engine being serviced to verify correct engine idle speed and operation.
Alternator belt is loose
Check the alternator belt tension. Refer to Procedure 013-001.
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.
Battery cables or connections are loose, broken, or corroded (excessive resistance)ย
Check the battery cables and connections. Refer to Procedure 013-009.
Batteries have malfunctioned
Check the condition of the batteries. Replace the batteries, if necessary. Refer to Procedure 013-007.
Alternator pulley is loose on the shaft
Tighten the pulley. Refer to the alternator manufacturers and/or OEM instructions.
Battery temperature is above specification
Position the batteries away from heat sources. Refer to the OEM service manual.
Alternator or voltage regulator is malfunctioning
Test the alternator output. Replace the alternator or voltage regu Iator if necessary. Refer to Procedure 013-001 and the OEM service manual.
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.
Electronic fault codes active or high counts of inactive fault codes
Read the fault codes with an electronic service tool. Refer to the Troubleshooting and Repair Manual, CM21 00 and CM2150 Electronic Control System, Bulletin 4021570.