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Home >> Chevrolet >> 1982 >> Chevette Base, 2D Hatchback, 1.8L Eng VIN D >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternators & Regulators >> Bench Testing >> Integrated Circuit Regulator
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Integrated Circuit Regulator

  1. Assemble a test circuit using the following components: One 10 ohm 3 watt resistor (R1 ), one 0-300 ohm 3 watt variable resistor (R2 ), two 12 volt batteries (BAT1 & BAT2 ) and on one 0-30 volt DC voltmeter. See  Fig 1 . 
  2. Adjust variable resistor (R2 ) until voltage at V4 reads the same as voltage at V3 (this should be all the way to one end of travel or 0 ohms).
  3. Connect the test circuit to the integrated circuit regulator terminals. Measure voltage at V1 and V2 . Voltage should measure 10-13 V at V1 and 0-2 V at V2 . Disconnect terminal S from circuit and measure voltage at V3 . Voltage at V3 should measure 20-26 V. Reconnect terminal S.
  4. Measure voltage at V2 while increasing resistance at R2 from 0 ohms. V2 should increase from 2 V up to 10-13 V. Stop increasing R2 when V2 reaches 10-13 V. If increase at V2 is interrupted at any point up to 10-13 V, while increasing resistance at R2 regulator is defective.
  5. Measure voltage at V4 while R2 is still at same setting, from previous step, that produced 10-13 V reading at V2 . If V4 is not within 14-14.6 V, regulator is defective.
    Fig 1: Test Circuit For Integrated Circuit Regulator
    G09358628Courtesy of GENERAL MOTORS COMPANY
  6. Disconnect the wire attached to terminal "S" and connect it to terminal "B". Repeat procedure from step 4).  If V2 does not vary or V4 is not within 14.5-16.6 V, regulator is defective and replacement is necessary.
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