Cummins/Onan 15.0 HA / 7.5 HA — Cranking Limiter Test

Testing & diagnosis

For the Cummins/Onan 15.0 HA / 7.5 HA, from the Cummins/Onan service manual.

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Procedure

1. Check continuity of the heater and check for heating during a starting cycle.
2. To test circuit breaking, disconnect the generator set remote start lead (terminal 3, remote) and apply a load.
3. The start-run relay should operate immediately.
4. After any start time delay and bilge blower time delay (begin Spec D only), the cranking limiter should heat.
5. After 45 to 90 seconds, the limiter should open.

Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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