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Overcharge Test

  1. Check battery voltage with engine running at 2000 RPM. If battery voltage is 15.4 volts or more, system is overcharging. Check ground connections of generator, engine and battery. If ground connections are okay, check fuses and fuse links and replace as necessary.
  2. With engine running at 2000 RPM, check voltage between ground and terminals "B+" and "A". See Figure. If voltage reading at terminal "A" is less than terminal "B+" by .5 volt or more, check "A" terminal circuit for open or excessive resistance. If voltage reading at terminals "B+" and "A" both exceed 15.4 volts, replace internal regulator or generator assembly.
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