Kohler Command PRO CS, Service Manual

Page: 74 / 162

8.18
Section 8
Electrical System and Components
NOTE: Observe the following guidelines to avoid
damage to the electrical system and
components.
• Make sure the battery polarity is correct. A
negative (-) ground system is used.
• Make sure all ground connections are secure
and in good condition.
• Disconnect both battery cables before doing
electrical welding on the equipment powered by
the engine. Also, disconnect other electrical
accessories in common ground with the engine.
• Prevent the stator (AC) leads from touching or
shorting while the engine is running. This can
damage the stator.
Stator
The stator is mounted on the crankcase behind the
flywheel. Should the stator have to be replaced, follow
the procedures in Section 9 Disassembly.
Rectifier-Regulator
The rectifier-regulator is connected to the engine with
a matching wiring harness containing a plug-in
connector. Grounded through the wiring harness, the
rectifier-regulator is secured to the equipment in a
suitable location with two mounting screws. To
replace it, disconnect the plug, and remove the two
mounting screws.
NOTE: When installing the rectifier-regulator, push
the wiring harness plug into the regulator
receptacle until it locks into place.
The rectifier-regulator converts the AC voltage coming
from the stator to DC voltage, while also monitoring
and controlling the battery voltage. There are two
different rectifier-regulators which are used; an 18
amp and a 7/10 amp assembly. Although externally
similar, the internal circuits differ and the two should
not be interchanged.
18 Amp Rectifier-Regulator
The 18 amp rectifier-regulators contain a 6-terminal
plug-in configuration, illustrated in Figure 8-23. The
upper center terminal is the control or
monitor
terminal, through which the regulator monitors
battery voltage. This terminal is connected internally
to SCRs, which are turned on and off as required,
controlling the battery voltage between 14 and 15
volts. The connection between the B+ (charge) lead
and the monitor terminal lead is made within the
wiring harness. The lower center terminal serves as a
connection for a pilot lamp circuit, to indicate when
the charging system is functioning.
+
–
~ Pilot Lamp
Terminal
B+ Charge
(Red)
Ground
(Black)
Monitor Terminal (Red)
Stator AC Leads (White)
Figure 8-24. 7/10 Amp Rectifier-Regulator.
– +
~ Floating/Isolated
Terminal
B+ Charge
(Red)
Ground (Black)
Stator AC Leads
(White)
Figure 8-23. 18 Amp Rectifier-Regulator.
7/10 Amp Rectifier-Regulator
The 7/10 amp rectifier-regulators contain a 5-terminal
plug-in configuration (See Figure 8-24), with two
differences from the 6-terminal/18 amp system.
Battery voltage is monitored by the internal circuitry
of the rectifier-regulator instead of through the lead
connection at the upper center location. The terminal
in the upper center location serves no function. No
lower center (pilot lamp) terminal exists on the 7/10
amp rectifier-regulator.