Electrical System
4162 690 01 Rev. C 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. Also, 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.
Most engines are equipped with a 15, 20, or 25 amp regulated charging system.
15/20/25 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.
Rectifi er-regulator is mounted on backing shroud assembly. To replace it, disconnect plug, remove two mounting
screws, and ground lead.
Testing of rectifi er-regulator may be performed as follows, using appropriate Rectifi er-Regulator Tester.
To Test
NOTE: Disconnect all electrical connections attached to rectifi er-regulator. Testing may be performed with rectifi er-
regulator mounted or loose. Figures show part removed from engine for clarity. Repeat applicable test
procedure two or three times to determine condition of part.
20/25 Amp Rectifi er-Regulators 15 Amp Rectifi er-Regulators
*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.
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 one of black leads to pair of
terminals on open end of tandem adapter lead
(connections are not location specifi c).
4. Connect remaining black lead from tester to one of
outer AC terminals 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 one of four 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 one of four lights will illuminate
indicating partial condition of part.
a. If OK (green) light comes on, disconnect tester
black lead attached to one 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.
b. If any other light is displayed* in either of tests,
rectifi er-regulator is faulty and should not 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.
1. Connect tester ground lead (with spring clamp) to
body of rectifi er-regulator being tested.
2. Connect tester red lead to B+ terminal of rectifi er-
regulator and two black tester leads to two AC
terminals.
3. Plug tester into proper AC outlet/power for tester
being used. Turn on power switch. POWER light
should be illuminated and one of four status lights
may be on as well. This does not represent condition
of part.
4. Press TEST button until a click is heard and then
release. Momentarily one of four status lights will
illuminate, indicating condition of part.
a. If OK (green) light comes on and stays steady,
part is good and may be used.
b. If any other light is displayed,* rectifi er-regulator
is faulty and should not be used.
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