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Home >> GMC >> 1978 >> Forward Control 5.7L Eng VIN L, Automatic Trans, Trans Mfr CD 475/M40 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Switches, Gauges & Instrument Panels >> Testing >> Indicator Warning Lights >> Charging System Indicator

Charging System Indicator

  1. If light is inoperative with ignition in "ON" position before starting engine, check for burned out bulb or short in wiring.
  2. If light is on with engine running, check for loose or missing belt, or short in the circuit. If good, check alternator (generator) and regulator for proper output.