Cummins/Onan — Testing Armature AC Windings - Continuity
Testing & diagnosis
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MCCK
Procedure
- Single phase: continuity should exist between collector rings M1-M2 and between M3-M4.
- On single-phase BFA models, continuity should exist only between M1 and M2.
- There should be no continuity between M2-M3.
- Three phase: continuity should exist between M1-M2, M2-M3, and M1-M3.
- Using an accurate ohmmeter, compare resistances to Tables 2-1 and 2-2.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan MCCK →
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.