Kohler — Separate Excitation - CZ/12-Lead
Testing & diagnosis · Generator exciter
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
- Disconnect all leads from voltage regulator.
- Remove exciter field F1 and F2 leads from TB2.
- Connect ammeter in series with F1 and 12 V battery.
- Record ammeter reading.
- Start engine and check ammeter remains stable.
- Check AC output across stator leads.
- 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
- 10/12CZ rotor resistance approx. 3.5 ohms
- Stator output voltages: leads 1-4,2-5,3-6 175 V; 55-66 FridayParts $28.69 190 V; B1-B2 Amazon eBay 25 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.