Kohler — 3/10 Amp Battery Charging System Test (No Charge to Battery)
Testing & diagnosis · Electrical System / Charging
From a Kohler service manual covering: 1P18 690 06, RH255, RH265. Check it applies to your exact model before use.
Applies to: Kohler RH255, Kohler RH265, Kohler RH265-0001 engine
Before you start
- Voltage tests should be made with engine running at 3600 RPM - no load. Battery must be fully charged.
Procedure
- Separate bullet connector in white lead from rectifier-regulator. Connect ammeter from female terminal to positive (+) battery terminal and DC voltmeter to negative (-) terminal. Run engine at 3600 RP
- If voltage is 14.0 volts or more, place a minimum load of 5 amps on battery to reduce voltage and observe ammeter.
- Separate bullet connectors in AC (white) leads. Connect an AC voltmeter across stator leads. With engine running at 3600 RPM, measure AC output from stator.
- With engine stopped, measure resistance from each stator lead to ground using an ohmmeter.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Voltage 14.0-15.0 volts and charge rate increases when load applied = charging system OK
- Voltage less than 14.0 volts or charge rate does not increase = test stator
- Stator AC output 20.0 volts or more = stator OK, replace rectifier-regulator
- Stator lead resistance infinity ohms (no continuity) = stator OK
Full service-parts list: Kohler RH255 →, Kohler RH265 →
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.