Kohler RH255 Service Manual page 28

Electrical System
Electronic Ignition System Tests
1. Disconnect cap from spark plug and attach it to
terminal end of spark tester. Attach tester spring clip
to a good ground, not to spark plug. Turn ignition
switch ON and crank engine while observing fi ring
tip of tester.
Condition
Tester is fi ring.
Tester doesn't fi re.
2. Set an ohmmeter to Rx1 scale and zero meter. Test
ignition switch as follows.
a. Trace two black leads from on/off switch and
separate them from any connections. Connect
ohmmeter leads to switch leads, and check for
continuity in both switch positions.
Condition
Continuity should be
indicated when and only
when switch is in OFF
position.
BATTERY CHARGING SYSTEMS
Wiring Diagram-Retractable Starter
B
A Ignition Module
C Ignition Switch
28
Conclusion
Ignition system is good.
Install a new spark plug
and try to start engine. If it
still will not start, check
other possible causes
(fuel, compression, etc.).
Unplug switch wire from
ignition module and retest
as described in test 1. If
no spark is present go to
step 2.
Conclusion
Replace switch for any
other results.
A
C
B Spark Plug
KohlerEngines.com
NOTE: Observe following guidelines to avoid damage to
electrical system and components:
● Make sure 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 equipment powered by engine. Also,
disconnect other electrical accessories in common
ground with engine.
● Prevent stator (AC) leads from touching or shorting
while engine is running. This could damage stator.
Most engines are equipped with a 3 or 10 amp regulated
battery charging system.
3/10 Amp Regulated Charging System
Stator
Stator is mounted on crankcase behind fl ywheel.
Should stator have to be replaced, follow procedures in
Disassembly.
Rectifi er-Regulator
NOTE: When installing rectifi er-regulator, push wiring
harness plug into regulator receptacle until it
locks into place.
Rectifi er-regulator is connected to engine with a
matching wiring harness containing a plug-in connector.
Grounded through wiring harness, rectifi er-regulator
is secured to equipment in a suitable location with two
mounting screws. To replace it, disconnect plug, and
remove two mounting screws.
Rectifi er-regulator converts AC voltage coming from
stator to DC voltage, while also monitoring and
controlling battery voltage.
Rectifi ed Only (non-regulated) Systems
Some engines are equipped with a rectifi ed only,
non-regulated charging system. Rectifi er is normally
connected to engine with a matching wiring harness and
secured inside control panel. Grounding is achieved
through wiring harness. Rectifi er converts AC voltage
coming from stator to DC voltage only.
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