Kohler — SCR Module Test
Testing & diagnosis
From a Kohler service manual covering: 10/15RMOY, 15/17.5ROY, 15RMY, 22.5-47.5ROZ, 22.5/32.5RZ. Check it applies to your exact model before use.
Applies to: Kohler 15RMY
Before you start
- The SCR module may be damaged if this step is performed incorrectly. Be sure to connect the NEGATIVE (-) lead of the battery to the POSITIVE (+) pin on the SCR module.
Procedure
- Check SCR Module with ohmmeter on RX1 Scale.
- Connect ohmmeter from (+) to (-): high resistance in one direction and low resistance in the other.
- Connect ohmmeter from AC1 to (+): high resistance in both directions. Repeat for AC2.
- Connect ohmmeter from AC1 to (-): high in one direction and low in the other. Repeat for AC2.
- G1 to (+) should see low resistance in one direction and higher in the other. Repeat for G2.
- Connect negative (-) lead from DC source to positive (+) pin on SCR module.
- Connect positive (+) lead from DC source, with lamp in series, to AC1 pin on SCR module. Lamp should not glow.
- Momentarily connect jumper, with resistor in series, from positive of DC source to G1 pin. Lamp should glow and continue to glow after removing jumper.
- Repeat steps 8 and 9 with AC2 and G2. If any check indicates a faulty SCR module - replace.
Tools required
- Ohmmeter (RX1 scale) Amazon
- 12-Volt DC source Amazon
- 100-500-Ohm resistor Amazon
- 12-Volt lamp Amazon
- Momentary jumper Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Kohler 15RMY →
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.