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Cummins/Onan — 1000 ohms).

For these Cummins/Onan models: 15.0 HA - 21 - a, 7.5 HA - 21 - a.

Applies to: Cummins Onan 15 0 Ha 21 A, Cummins Onan 7 5 Ha 21 A

Procedure

  1. 4. Check the rectifier by placing the ohmmeter leads on the terminals. The resistance should be higher in one direction than in the other (when leads are reversed). If resistance is zero or the same in both directions, replace rectifier.
  2. 5. The Zener diode (hangs below board, Spec A, mounted on board Spec B) should have high resistance in one direction and fairly high in the

Source: manual:907-0500 Onan HA Auto Demand Control Service Manual (06-1984).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.