Cummins/Onan — Stator and Inverter Unit Checking
Testing & diagnosis · stator / inverter unit
From a Cummins/Onan service manual covering: P3200i, P4300i, P4300ie, RG 3200 IS, RG 4300 IS, RG2800i. Check it applies to your exact model before use.
Applies to: Cummins/Onan P3200i, Cummins/Onan P4300ie, Subaru EX21 engine, Subaru EX27 engine
Before you start
- An inaccurate circuit tester may give erroneous readings.
Procedure
- Disengage connectors on the wires from the stator.
- Check the resistance between the wires using a circuit tester.
- For inverter unit, check for color change or blister in the filling resin.
- Check conductivity between the output wires and the 4P connector.
Tools required
- Circuit tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Measure at ambient temperature 20°C (68°F)
Full service-parts list: Cummins/Onan P4300ie →
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.