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Cummins/Onan — Resistors R2 and R4 should have resistances of

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. 200 ohms and 47 ohms respectively. Use R X 1
  2. 7. Resistance of resistors R6, R5, and R3 should be

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.