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Home >> GMC >> 1989 >> Forward Control 7.4 W, Automatic, 400/M40 >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Alternator & Regulator >> Testing >> Cs Series >> Alternator Output Test
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Alternator Output Test

  1. Connect an ammeter in circuit at "BAT" terminal of alternator. Turn on all available accessories. Connect a carbon pile across battery. Operate engine at 2000 RPM and adjust carbon pile as required to obtain maximum current output while maintaining 13 volts or more.
  2. Ampere output must be within 15 amps of rated output. See the CS SERIES ALTERNATOR OUTPUT SPECIFICATIONS . If output is not within 15 amps of rated output, replace alternator.
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