Kohler — PowerBoost V Voltage Regulator Test Procedure (240 Volt A- or B-Board)
Testing & diagnosis · PowerBoost V voltage regulator 240 Volt A- or B-board
From a Kohler service manual covering: 4CFKM, 4CKM, 5CKM, 5CKM/SCKMR, ACKM/4CKMR. Check it applies to your exact model before use.
Applies to: Kohler 4CFKM, Kohler 4CKM, Kohler 5CKM, Kohler M18 engine, Kohler M20 engine
Before you start
- Test regulator field for a maximum of one minute followed by a five-minute cooldown.
Procedure
- Connect components as shown in Figure 7-9.
- If plug is 250 volts use 250-volt lamp; if 120 volts use 120-volt lamp.
- Turn Volts potentiometer fully clockwise.
- Set variac to zero or minimum voltage and plug in.
- Slowly increase variac; lamp should illuminate at approximately 90 volts.
- Adjust variac to 240 volts; lamp should illuminate brightly.
- Turn Volts pot fully counterclockwise; lamp should go off.
- Turn power supply off and disconnect power cord.
Tools required
- 1:2 step-up transformer Amazon
- 250-volt 100-watt lamp Amazon
- AC voltmeter Amazon
- Variable transformer (Variac) Amazon
- 1-amp fuse Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Lamp illuminates at approximately 90 volts
- Do not exceed 300 volts
Full service-parts list: Kohler 4CFKM →, Kohler 4CKM →, Kohler 5CKM →
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.