Cummins/Onan — Solenoid Checkout
Testing & diagnosis · Start solenoid
From a Cummins/Onan service manual covering: 0.6MAJ, 1.0MAJ, 1.5MAJ, 1.5MAJ-224R, 1.5MAJ-232R, 2.5MAJ. Check it applies to your exact model before use.
Applies to: Cummins/Onan 2.5MAJ
Procedure
- Remove solenoid from circuit.
- Apply 12 volts to terminal marked Battery.
- Jumper a ground wire to terminal marked S on start solenoid.
- Solenoid should activate.
- If solenoid is good, 12 volts can be read between S and ground.
Specs & values
- 12 volts
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.