Kohler Command PRO CH940 Service Manual

Electrical System
4762 690 01 Rev. J KohlerEngines.com
To test 20/25 amp rectier-regulators:
1. Connect single lead adapter in between B+ (center)
terminal of rectier-regulator being tested and
squared single end of tandem adapter lead.
2. Connect tester ground lead (with spring clamp) to
body of rectier-regulator.
3. Connect red lead and 1 black lead to terminals on
open end of tandem adapter lead (connections are
not location specic).
4. Connect remaining black lead from tester to 1 outer
AC terminal on recti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.
To test 15 amp rectier-regulators:
1. Connect tester ground lead (with spring clamp) to
body of rectier-regulator being tested.
2. Connect tester red lead to B+ terminal of rectier-
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.
Condition Conclusion
20/25 amp 15 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.
Part is good and may be used.
NOTE: A 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.
Rectier-regulator is faulty and should not be used.
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 recti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 recti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 ywheel. Follow procedures in Disassembly and Reassembly if stator
replacement is necessary.
Rectier-Regulator
NOTE: When installing rectier-regulator, take note of terminal positions and install plug correctly.
NOTE: Disconnect all electrical connections attached to rectier-regulator. Testing may be performed with rectier-
regulator mounted or loose. Repeat applicable test procedure 2 or 3 times to determine condition of part.
Rectier-regulator is mounted on backing shroud assembly. To replace it, disconnect plug, remove mounting screws,
and ground lead.
Testing rectier-regulator may be performed as follows, using appropriate rectier-regulator tester.

Kohler Command PRO CH940 Specifications

General

Brand	Kohler
Model	Command PRO CH940
Category	Engine
Language	English