Cummins/Onan — Oil Level Switch Inspection
Testing & diagnosis
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Hold switch in normal position; ohmmeter should read zero resistance.
- Hold switch upside down; ohmmeter should read infinity.
- Inspect float by dipping switch into a container of oil; reading should go from zero to infinity as switch is lowered.
Tools required
- ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.