Kohler 4.5 CKM — Voltage Regulator Test
Testing & diagnosis
For the Kohler 4.5 CKM, from the Kohler service manual.
Applies to: Kohler 4.5 CKM, Kohler KT17II engine
Before you start
- Heat sink of the voltage regulator contains high voltage. Do not touch heat sink when testing.
- Unplug power cord from AC power source before connecting or disconnecting wires.
Procedure
- Connect components as shown in Figure 7-1.
- Plug in variable transformer and AC plug.
- Turn switch S1 on. Lamp should be on. If lamp does not go on, regulator is faulty; replace.
- Turn variable transformer on and slowly increase; lamp should go out at approximately 120 Volts and remain out.
- If lamp does not go out or stays at a dull glow, regulator is faulty and should be replaced.
- Turn switch S1 off and unplug AC cords.
Tools required
- Variable Transformer 0-140 Volts (.5 Amp Min.) Amazon
- 1 to 1 Isolation Transformer (.6 Amp Min.) Amazon
- 120 Volt AC Plug (60 Hz) Amazon
- Double Pole, Single Throw Switch Amazon
- 120 Volt, 100 Watt Lamp Amazon
- 2 Amp Fuse and Fuse Holder Amazon
- AC Voltmeter Amazon
- #14 AWG copper wire (minimum) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Lamp goes out at approximately 120 Volts
Full service-parts list: Kohler 4.5 CKM →
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.