Cummins/Onan — Start Solenoid Check (K11)
Testing & diagnosis · Start solenoid K11
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAQ, Cummins/Onan HDKAR
Procedure
- Apply battery positive (B+) to the terminal marked S.
- Connect a ground wire to the solenoid terminal marked I. The solenoid should activate.
- If contacts are good, battery voltage should be read between terminal 1 and ground.
- Voltage drop across the contacts should never exceed one volt in circuit application.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Voltage drop across contacts never exceed one volt
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAQ →, Cummins/Onan HDKAR →
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.