Cummins/Onan — Testing the Armature for Short Circuits
Testing & diagnosis
From a Cummins/Onan owner's manual covering: 1.5UF-232S, 10.0UF-150S, 12.0UF-3S, 12.0UF-4S, 15.0UB-150S, 15.0UF-3S/104, 2.0UF-125S, 2.0UF-232S/32, 2.0UG-1S/135, 2.5UF-1S, 2.SUD-IS, 2.SUD-IS/ID…. Check it applies to your exact model before use.
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Procedure
- Place the armature in a growler connected to alternating current.
- Hold a steel blade 1/4 inch from the armature laminations.
- Test all laminations from one side to the other.
- Revolve the armature about 1/8 revolution and test again.
- Continue until the armature has been tested completely around.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Steel blade held 1/4 inch from laminations
Source: Cummins/Onan owner's 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.