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Generator/Regulator Output Test

  1. Disconnect generator wiring harness connector. Turn ignition on. Connect voltmeter between terminals "L" (White/Green wire) or "IG" (Black/Yellow wire) and ground. See Figure. If no voltage exists, check for open in Black/Yellow wire or White/Green wire.
  2. Reconnect generator wiring harness connector. Start engine and bring to operating temperature. Connect voltmeter to battery and note voltage. With no load on charging system, increase engine speed to 2000 RPM. If voltage is less than 13 volts or greater than 16 volts, perform IC regulator test. See IC REGULATOR  under BENCH TESTING.
  3. Connect ammeter to generator White wire. Turn A/C on and blower motor on high. Increase engine speed to 2000 RPM. Generator output amperage should be 20-25 amps on manual transmission models and 25 amps on automatic transmission models. Voltage should not drop below 13 volts.
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