Electrical System Condition Conclusion 20/25 amp 15 amp 15/20/25 Amp Battery Charging Systems NOTE: Always zero ohmmeter on each scale before testing to ensure accurate readings. Voltage tests should be made with engine running at 3600 RPM with no load. Battery must be good and fully charged. When problems occur in keeping battery charged or battery charges at high rate, charging system or battery might be causing problems. To test charging system for no charge to battery: 1. Insert an ammeter in B+ lead from rectifi er-regulator. With engine running at 3600 RPM and B+ (at terminal on rectifi er-regulator) to ground using a DC voltmeter.
If voltage is 13.8 volts or more, place a minimum load of 5 amps (turn on lights if 60 watts or more, or place a 2.5 ohm, 100 watt resistor across battery terminals) on battery to reduce voltage. Observe ammeter. 3. With engine stopped, measure resistance across stator leads using an ohmmeter. Condition Conclusion 4. With engine stopped, measure resistance from each stator lead to ground using an ohmmeter. Condition Conclusion To test charging system for battery continuously charging at high rate: 1. With engine running at 3600 RPM, measure voltage from B+ lead to ground using a DC voltmeter. Condition Conclusion Condition Conclusion 2. Remove connector from rectifi er-regulator.
With engine running at 3600 RPM, measure AC voltage across stator leads using an AC voltmeter. Condition Conclusion 66 690 01 Rev. C KohlerEngines.com 33 OK (green) light comes on and stays steady. Disconnect tester black lead attached to 1 AC terminal and reconnect it to other AC terminal. Repeat test. If OK (green) light comes on again, part is good and may be used. Part is good and may be used. NOTE: A fl ashing LOW light can also occur as a result of an inadequate ground lead connection. Make certain connection location is clean and clamp is secure. Other lights come on. Rectifi er-regulator is faulty and should not be used. Resistance is 0.064/0.2 ohms. Stator is OK.
Resistance is 0 ohms. Stator is shorted; replace. Resistance is infi nity ohms. Stator is open; replace. Resistance is infi nity ohms (no continuity). Stator is OK (not shorted to ground). Resistance (or continuity) measured. Stator leads are shorted to ground; replace. Charge rate increases when load is applied. Charging system is OK and battery was fully charged. Charge rate does not increase when load is applied. Test stator and rectifi er- regulator (steps 2 and 3). Voltage is 14.7 volts or less. Charging system is OK. Battery is unable to hold charge; service or replace. Voltage is more than 14.7 volts. Faulty rectifi er-regulator; replace. Voltage is 28 volts or more. Stator is OK.
Rectifi er- regulator is faulty; replace. Voltage is less than 28 volts. Stator is faulty; replace. Test stator further using an ohmmeter (steps 3 and 4).