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Home›Repair guides›6. Disconnect control from generator set. Start engine using generator set controls. If it

Cummins/Onan — 6. Disconnect control from generator set. Start engine using generator set controls. If it

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. 7. If the generator set stops with a 100-watt load (generator set connected to automatic control), move auto-manual switch to “MANUAL.” Connect a jumper from terminal 6 to the ground terminal (in the automatic control). If the generator set doesn’t start, check continuity of K1 relay coil terminals 2-3 and 8. Resistance 2-3 equals approximately 100 ohms, 2-8 equals approximately 1000 ohms.
  2. 8. If relay is okay, check following voltages.

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.