Battery Charging System - Kohler command pro CH940 Service Manual

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 rectifier-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 rectifier-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 flywheel. Follow procedures in Disassembly and Reassembly if stator
replacement is necessary.
Rectifier-Regulator
NOTE: When installing rectifier-regulator, take note of terminal positions and install plug correctly.
NOTE: Disconnect all electrical connections attached to rectifier-regulator. Testing may be performed with rectifier-
regulator mounted or loose. Repeat applicable test procedure 2 or 3 times to determine condition of part.
Rectifier-regulator is mounted on backing shroud assembly. To replace it, disconnect plug, remove mounting screws,
and ground lead.
Testing rectifier-regulator may be performed as follows, using appropriate rectifier-regulator tester.
To test 20/25 amp rectifier-regulators:
1. Connect single lead adapter in between B+ (center)
terminal of rectifier-regulator being tested and
squared single end of tandem adapter lead.
2. Connect tester ground lead (with spring clamp) to
body of rectifier-regulator.
3. Connect red lead and 1 black lead to terminals on
open end of tandem adapter lead (connections are
not location specific).
4. Connect remaining black lead from tester to 1 outer
AC terminal on rectifier-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
OK (green) light comes on and stays steady.
NOTE: A flashing 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.
62 690 01 Rev. J
To test 15 amp rectifier-regulators:
1. Connect tester ground lead (with spring clamp) to
body of rectifier-regulator being tested.
2. Connect tester red lead to B+ terminal of rectifier-
regulator and 2 black tester leads to 2 AC terminals.
3. 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.
4. Press TEST button until a click is heard and then
release. Momentarily 1 of 4 status lights will
illuminate indicating condition of part.
20/25 amp
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.
Rectifier-regulator is faulty and should not be used.
KohlerEngines.com
Electrical System
Conclusion
15 amp
Part is good and may be used.
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