H ELECTRICAL SYSTEM H 151 SERVICE DIHGNOSIS SYMPTOMS PROBABLE REM EDY Battery Discharged Shorted Cell in Battery 4 Replace Battery Short in Wiring Check Wiring Circuit Generator Not Charging Inspect Generator and Fan Belt Loose or Dirty Terminals Clean and Tighten Excessive Use of Starter Tune Engine Excessive Use of Lights Check Battery Insufficient Driving r Recharge Battery Low Regulator Setting Correct Setting Stuck Cut out in Regulator Correct Low Electrolyte Level in Cells Add Distilled Water Alternator FAILS TO CHARGE Belt Loose 4 Tighten to Specifications Open or High Resistance in Charging or Ground Return Circuit or Battery Connections t Test and Correct Excessively Worn Open or Defective Brushes 4 Test Brushes and Replace if Necessary Open Isolation Diode w V Test and Replace if Necessary Open Rotor Field Coil 4 Test and Replace if Necessary LOW OR UNSTEADY CHARGING RATE Belt Loose Tighten to Specifications Intermittent or High Resistance it Charging or Ground Return Circuit or Battery Connections Test and Correct Excessively Worn Sticky or Intermittent Brushes r r Test and Replace if Necessary Shorted or Open Rectifier Diode 4 Test and Replace if Necessary Grounded or Shorted Turns in Rotor Field Coil Test and Replace if Necessary Open Grounded or Shorted Turns in Stator Test and Replace if Necessary EXCESSIVE CHARGE RATE Loose Connections on Alternator Check and Correct Faulty Regulator Check and Correct NOISY ALTERNATOR Defective or Badly Worn Belt Replace Misaligned Belt or Pulley Align Replace Parts as Necessary Loose Pulley Tighten Worn Bearings Replace Bearings as Necessary Shorted Rectifiers Test and Replace as Necessary Generator Low Charging Rate Dirty Commutator Clean Commutator Poor Brush Contact Repair or Install New Brushes Regulator Improperly Adjusted Adjust High Resistance in Charging Circuit Clean and Tighten Terminals Ground Strap Engine to Frame Broken Replace Loose or Dirty Terminals Clean and Tighten Slipping Generator Belt Adjust Belt Worn Out Brushes Install New Brushes W Weak Brush Spring Tension Replace Out of Round Commutator Repair 220