Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mazda >> 1994 >> B3000 Base, 2D Pickup, Standard >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator & Regulator >> On-Vehicle Testing >> Field Circuit Drain Test

Field Circuit Drain Test

  1. Turn ignition off. Connect voltmeter negative lead to generator rear housing (ground). Leave connected throughout this test. Connect voltmeter positive lead to terminal "F" screw. See Figure. If battery voltage is indicated, field circuit is okay. Further testing is not necessary. If less than battery voltage is indicated, disconnect regulator wiring harness connector.
  2. Connect voltmeter positive lead to terminal "I" of regulator wiring harness connector (with ignition off). If voltage is indicated, repair short to voltage in circuit "I".
  3. If no voltage is indicated, reconnect wiring harness connector to regulator. Connect voltmeter positive lead to terminal "S" of regulator wiring harness connector (backprobe terminal). If no voltage is indicated, replace regulator. If voltage is indicated, disconnect wiring harness connector from regulator.
  4. Connect voltmeter positive lead to terminal "S" of regulator wiring harness connector. If voltage is indicated, repair short to voltage in wiring harness. If no voltage is indicated, replace generator.
scientia non olet · About Mike's Workshop Manuals