Section 14-00: Battery and Charging System—Service
1994 Mustang Workshop Manual
DIAGNOSIS AND TESTING

Symptom Chart

 
ConditionPossible SourceAction
  • Battery Over-Charging (Battery Voltage Greater Than 15.5 V)
  • Voltage drop in 'A', Circuit 36 (Y/W).
  • Voltage drop in 'I', Circuit 904 (LG/R).
  • Poor ground.
  • Generator regulator.
  • Generator.
  • Indicator Lamp ON With Engine Running
  • Open 'A', Circuit 36 (Y/W).
  • Shorted 'I', Circuit 904 (LG/R).
  • Open/high resistance in 'S', Circuit 4 (W/BK).
  • Generator regulator.
  • Generator.
  • Indicator Lamp ON, Ignition Switch OFF
  • Lamp, Circuit 16 (R/LG) shorted to B+.
  • Improper lamp circuit wiring.
  • Instrument cluster.
  • Indicator Lamp OFF, Ignition Switch ON, Engine Not Running
  • Open/high resistance in 'I', Circuit 904 (LG/R).
  • Burned out lamp.
  • Poor ground.
  • 'S', Circuit 4 (W/BK) shorted to B+.
  • Generator regulator.
  • Generator.
  • Indicator Lamp Flickers or Intermittent
  • Loose connection to generator , generator regulator , or power distribution box.
  • Loose fuse or poor connection in Circuit 36 (Y/W).
  • Loose brush holder screw.
  • Generator regulator.
  • Generator.
  • Generator Noisy
  • Accessory drive belt .
  • Accessory brackets.
  • Bent pulley.
  • Generator.
  • Other accessories.
  • Radio Interference
  • Generator regulator.
  • Generator.
  • Other components.
  • Dead Battery
  • Battery Will Not Stay Charged
  • Slow Crank
  • Low Battery Voltage
  • No Generator Output
  • Ignition switch OFF battery drain.
  • Open/voltage drop in 'B+', Circuit 38 (BK/O).
  • Open/voltage drop in 'A', Circuit 36 (Y/W).
  • Open/high resistance in 'I', Circuit 904 (LG/R).
  • Generator regulator.
  • Generator.