Katolight E6921M1 / REO2IMI — Resistance Checks
Testing & diagnosis · Generator windings
For the Katolight E6921M1 / REO2IMI, from the Katolight service manual.
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Before you start
- If new field coil assemblies are installed, rotating field and exciter armature assembly must be dynamically balanced before reassembling.
- The insulation test must be done with three exciter armature leads disconnected from rotating rectifier assembly, otherwise rectifiers could be damaged.
Procedure
- Exciter field: detach one lead; measure resistance to corresponding lead; compare with resistance limits table; repeat on CF if used.
- Rotating field coils: detach both alternator field leads at rotating rectifier assembly; measure total resistance; check insulation resistance between shaft and one detached lead.
- Alternator armature: blow out dirt; inspect insulation of coils and leads; check coils and insulators tight in slots; check insulation resistance.
- Exciter armature: detach all three leads at rotating rectifier; measure phase-to-phase resistance at armature terminals; each phase should be within limits.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Katolight 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.