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ES series — Across

For the ES series.

Before you start

  • WARNING HAZARDOUS VOLTAGE. Touching

Procedure

  1. 3. Open switch in 120 VAC supply to VARIAC.
  2. 4. Plug VARIAC into 120 VAC source.
  3. 5. Proceed with checkout according to steps in Table
  4. 1. Locate terminals 7 (–) and 8 (+) on voltage regulator
  5. 2. Use a six volt dry cell battery with two clip leads and
  6. 3. After starting engine, touch positive (+) battery lead
  7. 1. Disconnect all leads from assembly to be tested.
  8. 2. Connect one test lead to F1+ stud and connect other
  9. 3. Connect one lead to F2– stud and connect other
  10. 4. Reverse ohmmeter leads from steps 2 and 3 and re-
  11. 5. All the resistance readings should be high in one
  12. 6. Replace defective rectifier assembly with new, iden-
  13. 1. Connect one ohmmeter lead to each end of diode
  14. 2. Reverse ohmmeter leads and again observe resist-
  15. 3. Replace defective diodes with new, identical parts.
  16. 1. Using high scale on ohmmeter, connect ohmmeter
  17. 2. Using a 6 volt dry cell battery and a 200 ohm series
  18. 11. Observe polarity and connect a DC voltmeter
  19. 3. If the SCR does not pass either test, it is defective.

Source: manual:928-0504_Onan_ES_begining_spec_G_Generator__Controls_Service_manual_06-1995.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.