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Home›Repair guides›Kohler›Separate Excitation Test

Kohler — Separate Excitation Test

Testing & diagnosis · generator rotor/stator

From a Kohler service manual covering: 10CC, 7CCFO, 7CCO. Check it applies to your exact model before use.

Applies to: Kubota D905BG-2 engine, Kubota V1305BG-2 engine

Before you start

  • Hazardous voltage. Perform electrical service only as prescribed.

Procedure

  1. Disconnect all leads from voltage regulator.
  2. Connect ammeter and 12-volt battery to brush leads; include 10-amp fuse.
  3. Ammeter reading equals battery voltage divided by rotor resistance.
  4. Start engine; check that ammeter remains stable.
  5. Check AC output across stator leads; compare to Section 10 specifications.
  6. If rotor and stator test good, replace voltage regulator.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Rotor resistance cold: 7CCO 3.9 ohms; 10CCO 4.3 ohms

Full service-parts list: Kubota D905BG-2 engine →, Kubota V1305BG-2 engine →

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.

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