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Home >> Buick >> 1995 >> Roadmaster Base >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Alternator & Regulator >> Bench Testing >> Generator Output Test >> CS144 (Without Auxiliary Phase Terminals)

CS144 (Without Auxiliary Phase Terminals)

  1. Mount generator on test stand. Set test stand controls to turn generator clockwise. Ensure ground polarity of generator and battery are the same. Ensure battery is fully charged. Connect voltmeter, ammeter and carbon pile (in OFF position). Connect 30-500 ohm resistor between battery and terminal "L" of the generator. See Fig 1.
  2. Slowly increase generator speed while observing voltmeter. If output is uncontrolled and increases to greater than 16 volts, rotor field coil is shorted and/or regulator is defective. A shorted rotor field coil can cause regulator failure. Replace or repair generator.
  3. If voltage is less than 16 volts, increase speed and adjust carbon pile to obtain maximum generator output. Maintain voltage greater than 13 volts. If amperage output is within 15 amps of rated output, generator is okay. If amperage output is not within 15 amps of rated output, replace or repair generator. Refer to the GENERATOR USAGE/AMP OUTPUT RATING  table.
Fig 1: Bench Testing Generator (CS144)
G95C13468Courtesy of GENERAL MOTORS CORP.
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