Kohler KD 441 — Testing voltage regulator for proper operation
Testing & diagnosis
For the Kohler KD 441, from the Kohler service manual.
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Before you start
- When the engine is running do not disconnect battery cables or switch key to off position.
- Do not place the governor near heat sources, but in well ventilated areas above 75°C.
- Do no electric welding on engine or application.
Procedure
- Check that connections correspond to the schematic.
- Disconnect the terminal from the battery positive pole.
- Connect a d.c. voltmeter between the battery poles.
- Fit an ammeter between the positive pole and the B+ on voltage regulator.
- Start and stop the engine several times until battery voltage drops below 13V.
- When battery voltage reaches 14.5V the ammeter current should suddenly drop down to almost zero.
- Replace regulator if recharge current is zero with voltage below 12.5V.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Regulator 14.5V, 20A
- Replace if recharge current is zero with voltage below 12.5V
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.