Kohler Command PRO CS Service Manual page 79

Troubleshooting Guide – Electric Starting System
Problem
1. Test battery on unit.
a. Connect a DC voltmeter across the battery
terminals and read battery voltage (key
switch off).
b. Turn key switch to start position and
read battery voltage again. Turn switch off.
2. Remove the electric starter cover panel and check
the fuse inside the plastic holder. The fuse outside
the holder is a spare.
3. Disconnect the red/white solenoid lead from red/
white switch lead at the bullet connection. Be sure
transmission is in neutral and PTO is off.
Connect one end of a jumper lead to the positive
terminal of the battery. Connect the other end to
the terminal of the red/white solenoid lead.
4. Use a known, good, fully-charged battery and
jumper cables to test starter motor. Be sure the
transmission is in neutral and PTO is off.
Starter
Inertia Drive Starters: Remove the heavy lead
Motor Does
from the post terminal on the starter. Connect one
Not Operate
end of the positive jumper cable to the post
With Key
terminal and connect the other end to the positive
Switch
terminal of the battery.
Solenoid Shift Starters: Connect one end of the
positive jumper cable to the positive brush lead
attached to the lower stud terminal of solenoid.
Connect the other end to the positive terminal of
the battery.
Connect one end of the negative jumper cable to
the negative terminal of the battery. Touch the
other end of the negative jumper cable to a bare
surface on the crankcase or to the starter housing.
5. Inertia Drive Starters: Disconnect the leads from
the starter solenoid and remove it from the starter
for testing. See Figure 8-33 on page 8.25.
a. Set an ohmmeter on the Rx1 scale and zero
the meter. Connect one ohmmeter lead to the
terminal of the red/white lead from the
solenoid. Connect the other ohmmeter lead to
the solenoid mounting bracket.
b. With the ohmmeter still on the Rx1 scale,
connect the leads to the two large post
terminals.
c. Leave the ohmmeter leads connected to the
large terminals. Connect a jumper lead from
the positive terminal of the battery to the
terminal of the red/white solenoid lead.
Connect another jumper lead from the negative
terminal of the battery to the solenoid
mounting bracket.
Solenoid Shift Starters: Perform the solenoid
tests on page 8.24.
Electrical System and Components
Test Conclusion
1. a. Battery voltage should be at least 12 volts
If low charge battery.
b. Battery voltage should not fall below 9 volts
during cranking. If it does, battery may be
faulty or there may be a short in the starting
circuit. Have battery load tested. If battery
passes load test, check circuitry.
2. If fuse is blown, check for a wiring problem
(bare wire, short circuit). Correct problem and
replace fuse. Try to start engine. If it still won't
start, go to step 3.
3. If solenoid engages and starter begins to crank,
the key switch is faulty, or there is a wiring
problem to/from the key switch. Check wiring
and test key switch circuits with an ohmmeter.
4. When negative jumper cable is touched to
crankcase or starter housing, starter motor
should operate. If it does, continue with step 5.
If starter does not operate, refer to the servicing
procedures for the starter motor and check out
the brushes and armature. Repair or replace as
required.
5. a. The resistance of the energizing coil should
be at least 3.4 ohms. If the meter reading is
less than 3.4 ohms, or an open circuit is
indicated (infinity ohms), the solenoid is
faulty and must be replaced.
b. The meter should indicate an open circuit
(infinity ohms, no continuity).
c. When the circuit is completed, applying 12
volts to the energizing coil, an audible click
should be heard as the solenoid engages,
and the ohmmeter should then indicate
continuity between the large terminals. If
the results are other than indicated, replace
the solenoid.
Section 8
8
8.23