Electrical System
6162 690 13 Rev. A KohlerEngines.com
BATTERY CHARGING SYSTEM
NOTE: Observe following guidelines to avoid damage to electrical system and components:
● Make sure battery polarity is correct. A negative (–) ground system is used.
● Disconnect rectifi er-regulator plug and/or wiring harness plug before doing any electric welding on equipment
powered by engine. Disconnect all other electrical accessories in common ground with engine.
● Prevent stator (AC) leads from touching or shorting while engine is running. This could damage stator.
NOTE: 20 amp charging systems use a 15 amp stator with a 25 amp rectifi er-regulator.
These engines are equipped with a 20 or 25 amp regulated charging system.
20/25 Amp Regulated Charging System
Stator
Stator is mounted on crankcase behind fl ywheel. Follow procedures in Disassembly and Reassembly if stator
replacement is necessary.
Rectifi er-Regulator
NOTE: When installing rectifi er-regulator, take note of terminal positions and install plug correctly.
NOTE: Disconnect all electrical connections attached to rectifi er-regulator. Testing may be performed with rectifi er-
regulator mounted or loose. Repeat applicable test procedure 2 or 3 times to determine condition of part.
Rectifi er-regulator is mounted on backing shroud assembly. To replace it, disconnect plug, remove mounting screws,
and ground lead.
Testing rectifi er-regulator may be performed as follows, using appropriate rectifi er-regulator tester.
To test 20/25 amp rectifi er-regulators:
1. Connect single lead adapter in between B+ (center) terminal of rectifi er-regulator being tested and squared single
end of tandem adapter lead.
2. Connect tester ground lead (with spring clamp) to body of rectifi er-regulator.
3. Connect red lead and 1 black lead to terminals on open end of tandem adapter lead (connections are not location
specifi c).
4. Connect remaining black lead from tester to 1 outer AC terminal on rectifi er-regulator.
5. Plug tester into proper AC outlet/power for tester being used. Turn on power switch. POWER light should be
illuminated and 1 of 4 status lights may be on as well. This does not represent condition of part.
6. Press TEST button until a click is heard and then release. Momentarily 1 of 4 lights will illuminate indicating partial
condition of part.
Condition Conclusion
20/25 amp
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.
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.
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