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Cummins/Onan — With the printed circuit board positioned as shown in

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. 1. Condenser C1 and resistor R1 have a resistance of approximately 2100 ohms in one direction and 900 ohms in the other direction.
  2. 2. Rectifiers CR2 and CR3 normally have resistance of 3700 ohms in one direction and 600 ohms in the other direction.

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.