Cummins/Onan — Solenoid Checkout (D)
Testing & diagnosis · start solenoid
From a Cummins/Onan service manual covering: DL4, DL6, DL6T. Check it applies to your exact model before use.
Applies to: Cummins/Onan DL4, Cummins/Onan DL6, Cummins/Onan DL6T
Procedure
- Apply battery positive (B+) to the terminal marked S.
- Jumper a ground wire to the solenoid mounting bracket; solenoid should activate.
- If contacts are good, 12 volts should be read between terminal I 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
- Contact voltage drop never exceeds one volt
Full service-parts list: Cummins/Onan DL6 →
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.