Kohler — Battery Charging System Test
Testing & diagnosis
From a Kohler service manual covering: KT610, KT620, KT715, KT725, KT730, KT735, KT740, KT745. Check it applies to your exact model before use.
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Procedure
- Insert an ammeter in B+ lead from rectifier-regulator. With engine running at 3600 RPM, measure B+ to ground using a DC voltmeter.
- If voltage is 13.8 volts or more, place a minimum load of 5 amps on battery to reduce voltage. Observe ammeter.
- If charge rate increases when load is applied, charging system is OK and battery was fully charged.
- If charge rate does not increase, remove connector from rectifier-regulator. With engine running at 3600 RPM, measure AC voltage across stator leads using an AC voltmeter.
- Voltage is 28 volts or more: stator is OK; rectifier-regulator is faulty; replace.
- Voltage is less than 28 volts: stator is faulty; replace. Test stator further using an ohmmeter.
- With engine stopped, measure resistance across stator leads. Resistance is 0.064/0.2 ohms: stator is OK.
- Resistance is 0 ohms: stator is shorted; replace. Resistance is infinity ohms: stator is open; replace.
- Measure resistance from each stator lead to ground. Resistance is infinity ohms (no continuity): stator is OK. Resistance measured: stator leads are shorted to ground; replace.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Battery charging voltage 13.8 V or more with load
- Stator AC voltage 28 V or more
- Stator resistance 0.064/0.2 ohms
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.