Kohler — Separately Excite — Brushless Models (RZ)
Testing & diagnosis · Generator exciter field
From a Kohler service manual covering: 10RMOY, 15RMOY, 15RMY, 15ROY, 17.5ROY, 22.5ROZ, 22.5RZ, 24ROZ, 32.5ROZ, 32.5RZ, 47.5ROZ. Check it applies to your exact model before use.
Applies to: Kohler 15RMY, Kohler 15ROY, Kohler 17.5ROY, Kohler 22.5ROZ, Kohler 22.5RZ, Kohler 24ROZ, Kohler 32.5ROZ, Kohler 32.5RZ, Kohler 47.5ROZ
Procedure
- Disconnect and insulate V7, V8, V9, VO and V4 from terminal strip; disconnect and insulate L1, L2 and L3.
- Disconnect exciter leads F1 and F2 at quick disconnect.
- Place voltmeter across F3 and F4; connect ammeter in series with F3.
- Start unit and read battery voltage; ammeter should read 4/10 of 1 amp.
- If voltage is not present, problem is in controller; if current is high or low, problem is in the exciter field.
- Check L1, L2, L3, V7, V8, V9, VO and V4 with a voltmeter for output (25-35 volts).
- If there is output, check the Automatic Voltage Regulation (AVR) circuit.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Exciter ammeter reading: 4/10 of 1 amp
- AC output check: 25-35 FridayParts $25.27 volts
Full service-parts list: Kohler 15RMY →, Kohler 15ROY →, Kohler 17.5ROY →, Kohler 22.5ROZ →, Kohler 22.5RZ →, Kohler 24ROZ →, Kohler 32.5ROZ →, Kohler 32.5RZ →, Kohler 47.5ROZ →
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.