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Cummins/Onan — IN (SPEC A AND B)

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. Move auto-manual switch to “MANUAL” position. Connect a jumper from terminal 6 to terminal 1. Move auto-manual switch to “AUTO” position. Generator set should start and run.
  2. 2. Apply a load and remove jumper while generator set is running with switch at “AUTO.” If generator set stops, place switch to “MANUAL” and restart.

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.