Kohler LH630-775 Service Manual page 95

Section 8
Electrical System and Components
Reported ignition problems are most often due to
poor connections. Before beginning the test
procedure, check all external wiring. Be certain all
ignition-related wires are connected, including the
spark plug leads. Be certain all terminal connections
fit snugly. Make sure the ignition switch is in the run
position.
NOTE: The CD ignition systems are sensitive to
excessive load on the kill lead. If a customer
complains of hard starting, low power, or
misfire under load, it may be due to excessive
draw on the kill circuit. Perform the
preliminary test which follows.
Preliminary Test
To be certain the reported problem is in the engine
ignition system, it should be isolated from the unit.
1. Locate the plug connectors where the wiring
harnesses from the engine and unit are joined.
Separate the connectors and remove the white
''kill'' lead from the engine connector. Rejoin the
connectors and position or insulate the kill lead
terminal so it cannot touch ground. Try to start*
the engine to verify whether the reported
problem is still present.
a. If the problem is gone, the electrical system
on the unit is suspect. Check the key switch,
wires, connections, safety interlocks, etc.
b. If the problem persists, follow the test
procedure on the next page. Leave the kill
lead isolated until all testing is completed.
*NOTE: If the engine starts or runs during any of the
testing, you may need to ground the kill lead
to shut it down. As you have interrupted the
kill circuit, it may not stop with the switch.
2. Test for spark on both cylinders with Kohler
ignition tester (see Section 2). Disconnect one
spark plug lead and connect it to the post
terminal of the tester. Connect the clip to a good
ground, not to the spark plug. Crank the engine
and observe the tester spark gap. Repeat the
procedure on the other cylinder. Remember to
reconnect the first spark plug lead.
a. If one side is not firing, check all wiring,
connections, and terminations on that side. If
wiring is okay, replace ignition module and
retest for spark.
8.6
b. If the tester shows spark, but the engine
misses or won't run on that cylinder, try a
new spark plug.
c. If neither side is firing, recheck position of
ignition switch and check for shorted kill
lead.
Battery Charging System
General
These engines are equipped with either a 15, 20 or 25
amp regulated charging system. See Figure 8-6 for the
15/20/25 amp system diagram.
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.
• Disconnect the plug from the rectifier-regulator
and the battery cables before doing electric
welding on the equipment powered by the
engine.
• Prevent the stator (AC) leads from touching or
shorting while the engine is running. This could
damage the stator.
Wiring Color Codes
B
L
R
Y
W
P
O
L/R
Black
Blue
Red
Yellow
White
Purple
Orange
Blue/Red