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System Current Output Test

  1. Ensure battery is charged and in good condition. Turn all accessories and vehicle lighting off. Start engine and allow it to reach operating temperature. Turn ignition off. Using a 0-150 amp DC inductive ammeter, connect ammeter pick-up to positive battery cable. Using a voltmeter (0-18 volts), connect negative voltmeter lead to negative battery terminal. Connect positive voltmeter lead to positive battery terminal.
    CAUTION: To prevent damage to test equipment, DO NOT  apply carbon pile rheostat load for more than 15 seconds. Ensure carbon pile is in OFF position before connecting leads.
  2. Connect carbon pile rheostat between battery terminals. Start engine. Increase engine speed to 2500 RPM. Slowly adjust carbon pile rheostat to obtain highest amperage reading. DO NOT  allow voltage to drop below 12 volts. Record ammeter reading. Amperage should meet MINIMUM TEST AMPS specification. See GENERATOR SPECIFICATIONS . If amperage is not as specified, go to GENERATOR CURRENT OUTPUT TEST heading below.
  3. Continue holding engine speed at 2500 RPM. Rotate carbon pile rheostat to off position. If EVR circuitry is okay, amperage should drop below 15-20 amps. With all accessories and vehicle lighting off, this could take several minutes of engine operation. If amperage does not drop, go to SELF-DIAGNOSTIC TESTS .
NOTE: Generator current output test is used to check generator amperage only and does not include analysis of Electronic Voltage Regulator (EVR) circuitry.
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