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Home›Repair guides›Kohler›Separate Excitation - CC/4-Lead

Kohler — Separate Excitation - CC/4-Lead

Testing & diagnosis · Generator rotor/stator

From a Kohler service manual covering: 10C, 10CC, 10CFC, 10CFZ, 12C, 12CFC, 12CFZ, 40CZ, CZ/12-Lead. Check it applies to your exact model before use.

Applies to: Kohler 10C, Kohler 12C, Ford VSG-411 (10 kW) / VSG-413 (12 kW) engine

Before you start

  • Hazardous voltage.

Procedure

  1. Disconnect all leads from voltage regulator.
  2. Connect ammeter and 12 V battery to positive and negative brush leads.
  3. Record ammeter reading; approx. battery voltage divided by rotor resistance.
  4. Start engine and check ammeter remains stable.
  5. Check AC output across stator leads.
  6. If rotor and stator test good, voltage regulator is likely defective.

Tools required

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

Specs & values

  • 10CC rotor resistance approx. 4 ohms
  • 12CC rotor resistance approx. 3.5 ohms
  • Stator output voltages: leads 1-2, 3-4, 33-44 100 V (10CC) / 90 V (12CC); 33-55 150 V (10CC) / 140 V (12CC); B1-B2 Amazon eBay 8 V

Full service-parts list: Kohler 12C →

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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