Kohler — Voltage regulator operation check
Testing & diagnosis · Electric system / voltage regulator
From a Kohler service manual covering: KD 626-3, KD 626-3 B2 NR, KD 626-3 EPA, KD 626-3 NR. Check it applies to your exact model before use.
Applies to: Kohler KD 626-3, Kohler KD 626/3 engine
Before you start
- When the engine is running do not disconnect battery cables or remove the key from the control panel
- Keep regulator away from heat sources (above 75°C may damage it)
- No electric welding on engine or application
Procedure
- Check that connections correspond to the layout.
- Disconnect the terminal from the battery positive pole.
- Connect a d.c. voltmeter between the two battery poles.
- Fit an ammeter between the positive pole and the corresponding cable 1 terminal.
- Start a couple of times until battery voltage drops below 13 V.
- When battery voltage reaches 14,5 V the ammeter current suddenly drops to almost zero.
- Replace regulator if recharge current is zero with voltage below 14 V.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Regulator 12 V, max. current 26 A
- When battery voltage reaches 14,5 V current drops to almost zero
Full service-parts list: Kohler KD 626-3 →
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.