M11 Series Engines – Alternator Not Charging or Insufficient Charging

Symptom Tree  t013

This is symptom tree t013
Cause Correction

Alternator belt is loose

Check the alternator belt tension. Refer to Procedure 013-005.

 

Alternator pulley is loose on the shaft

Tighten the pulley. Refer to the manufacturer’s instructions.

 

Alternator drive pulley is loose on the water pump shaft

Make sure the drive pulley is tight on the shaft. Refer to Procedure 009-010.

 

Battery cables or connections are loose, broken, or corroded (excessive resistance)

Check the battery cables and connections. Refer to Procedure 013-009.

 

Batteries have failed

Check the condition of the batteries, replace if necessary. Refer to Procedure 013-007 and the OEM service manual.

 

Vehicle gauge is malfunctioning

Check the vehicle gauge. Refer to the OEM service manual.

 

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.

 

Electrical system is “open” (blown fuses, broken wires, or loose connections)

Check the fuses, wires, and connections. Refer to the OEM service manual .

 

Alternator is overloaded, or alternator capacity is below specification

Install an alternator with a higher capacity. Refer toProcedure 013-001 and the OEM service manual.

 

Battery temperature is above specification

Position the batteries away from heat sources. Refer to the OEM service manual.

 
Last Modified:  05-Jan-2004