Cummins/Onan — Troubleshoot - Engine Will Not Crank
Testing & diagnosis · Starting system
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Check battery condition
- Check battery connections
- Check manual engine rotation
- Check wiring connections to and from control, relay, switch, and starter
- Check Start/Stop switch
- Check starter
- Check stop solenoid adjustment
Specs & values
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.