Cummins/Onan — Start Solenoid Check
Testing & diagnosis
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKAD, Cummins/Onan MDKAE, Cummins/Onan MDKAF
Procedure
- Apply battery positive (B+) to terminal marked S.
- Connect a ground wire to solenoid terminal marked I. The solenoid should activate.
- If contacts are good, battery voltage should be present between terminal 1 and ground.
- Voltage drop across contacts should never exceed one volt in circuit application.
Specs & values
- <=1 volt
Full service-parts list: Cummins/Onan MDKAD →, Cummins/Onan MDKAE →, Cummins/Onan MDKAF →
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.