Cummins/Onan 15.0 HA / 7.5 HA — Time Delay Relay Test
Testing & diagnosis
For the Cummins/Onan 15.0 HA / 7.5 HA, from the Cummins/Onan service manual.
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Procedure
- Apply a load to the control and watch contact operation.
- One contact should bend to close the circuit with the time delay.
- If contacts do not close, check voltage at the heater terminals of the relay socket.
- Check continuity of the heater.
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.