Cummins/Onan — Armature Grounded Circuit Test
Testing & diagnosis · armature windings
From a Cummins/Onan service manual covering: 10C, 10CW, 10CW-150R, 5CW, 5TW-0R, 6CW-54R, 7.5C, 7.5CW, 8CW. Check it applies to your exact model before use.
Applies to: Cummins/Onan 10CW, Cummins/Onan 10CW-150R
Procedure
- Connect one test lamp lead to a bare metal point on the armature shaft.
- Contact the other test lead to the commutator surface.
- If the test lamp glows, the dc portion of the armature is grounded.
- Repeat the test contacting the collector rings.
- If the lamp glows, the ac portion of the armature is grounded.
- Replace a grounded armature with a new one.
Tools required
- test lamp set Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan 10CW →, Cummins/Onan 10CW-150R →
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.