Cummins/Onan — Starter Solenoid Test (GH280 Engine)
Testing & diagnosis
From a Cummins/Onan service manual covering: 1.4 EGPAA, 1.7 EGPAA, 2.0 EGHAM, 2.0 EGPAB, 2.5 EGHAA, 2.5 EGPAB, 3.5 EGHEM, 3.5 EGPAC, 4.0 EGHAB, 4.0 EGHEB, 4.0 EGPAC, 5.0 EGHAB…. Check it applies to your exact model before use.
Applies to: Cummins/Onan 2.5 EGHAA, Cummins/Onan 4.0 EGHAB, Cummins/Onan 5.0 EGHAB, Cummins/Onan GH170 engine, Cummins/Onan GH280 engine, Cummins/Onan Elite E140H engine
Before you start
- Disconnect battery before servicing to prevent accidental starting.
Procedure
- Connect jumper lead between battery positive (+) terminal and solenoid S terminal.
- Momentarily connect jumper between battery negative (-) and solenoid body.
- Solenoid contacts should close; replace solenoid if it does not activate.
Tools required
- jumper leads 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.