Kohler — Rotor Resistance Check
Testing & diagnosis
From a Kohler service manual covering: 4CFKM, 4CKM, 5CKM, 5CKM/SCKMR, ACKM/4CKMR. Check it applies to your exact model before use.
Applies to: Kohler 4CFKM, Kohler 4CKM, Kohler 5CKM, Kohler M18 engine, Kohler M20 engine
Before you start
- When checking rotor resistance with rotor installed, brushes must not be in contact with rotor slip rings.
Procedure
- Measure rotor resistance between the two slip rings.
- Take readings at room temperature or about 70° F (21°C).
- Adjust ohmmeter to zero ohms for short-to-ground test.
- Touch one lead to either slip ring and other to rotor poles or shaft.
- Meter should register no continuity to ground.
- Repair or replace rotor if faults are detected.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- See Specifications—Generator in Section 1 for typical readings
Full service-parts list: Kohler 4CFKM →, Kohler 4CKM →, Kohler 5CKM →
Source: Kohler 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.