Kohler HD Series

35
Electrical System
14 690 10 Rev. -- KohlerEngines.com
Electronic Ignition System Tests (Electric Start)
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. With ignition
switch ON, crank engine to a minimum of 350-450
RPM while observing fi ring tip of tester.
Condition Conclusion
Visible and/or audible
sparks are produced.
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.).
Visible and/or audible
sparks are not produced.
Test kill lead circuit (step
2).
2. Remove retractable starter and engine cover; refer
to Disassembly/Inspection and Service. Disconnect
kill lead from ignition module. Repeat spark test
(step 1).
Condition Conclusion
Spark is now present. Check for a shorted lead
in kill circuit or a faulty
switch (step 4).
Still no spark. Test ignition module (step
3).
3. Set an ohmmeter to Rx1K or Rx10K scale and zero.
Connect one ohmmeter lead to module kill lead tab
and connect other lead into spark plug cap.
Resistance should be 5-15 K ohms. If resistance is
not in this range, replace ignition module.
4. Test ignition/key switch following equipment
manufacturer's instructions. Refer to equipment
manufacturer's manual.
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) lead (if equipped) from touching or
shorting while engine is running. This could damage
stator.
Wiring Diagram-Electric Start with Retractable Starter, No Charging System
+
B
E
C
D
F
A
A Ignition Module B Spark Plug C Brake Micro Switch D
Switch/Key Switch
(OEM Supplied)
E Starter Motor F
12 Volt Battery (OEM
Supplied)