Kohler COMMAND CH18-745 - Manual (Page 138)

8.21
Section 8
Electrical System and Components
8
Troubleshooting Guide
3 amp Battery Charging System with 70 Watt Lighting Stator
NOTE: Zero ohmmeters on each scale to ensure accurate readings. Voltage tests should be made with engine
running at 3000 RPM - no load. Battery must be good and fully charged.
Problem
No
Charge
to
Battery
No
Lights
Test
1. With engine running at 3000 RPM, measure
voltage across battery terminals using a DC
voltmeter.
2. Disconnect the charging lead from battery.
With engine running at 3000 RPM, measure
voltage from charging lead to ground using a
DC voltmeter.
3. With charging lead disconnected from battery
and engine stopped, measure resistance from
charging lead to ground using an ohmmeter.
Note reading.
Reverse the leads and measure resistance
again.
In one direction, the resistance should be
infinity ohms (open circuit). With the leads
reversed, some resistance should be
measured (about midscale on Rx1 range).
4. Cut the sleeving on the charging lead to
expose the diode connections.
Measure the resistance from the stator side of
diode to ground using an ohmmeter.
1. Make sure lights are not burned out.
2. Disconnect the lighting lead from the wiring
harness.
With engine running at 3000 RPM, measure
voltage from lighting lead to ground using an
AC voltmeter.
3. With engine stopped, measure the resistance
of stator from lighting lead to ground using an
ohmmeter.
Conclusion
1. If voltage is more than 12.5 volts, charging
system is OK.
If voltage is 12.5 volts or less, the stator or diode
are probably faulty. Test the stator and diode
(Tests 2, 3 and 4).
2. If voltage is 28 volts or more, stator winding is
OK.
If voltage is less than 28 volts, test stator using
an ohmmeter (Tests 3 and 4).
3. If resistance is low in both directions, the diode
is shorted. Replace the diode.
If resistance is high in both directions, the diode
or stator winding is open. (Use Test 4.)
4. If resistance is approximately 1.07 ohms,
stator winding is OK.
If resistance is 0 ohms, stator winding is
shorted. Replace stator.
If resistance is infinity ohms, stator winding or
lead is open. Replace stator.
1. Replace burned out lights.
2. If voltage is 15 volts or more, stator is OK.
Check for loose connections or shorts in wiring
harness.
If voltage is less than 15 volts, test stator using
an ohmmeter (Test 3).
3. If resistance is approximately 0.4 ohms,
stator is OK.
If resistance is 0 ohms, stator is shorted.
Replace stator.
If resistance is infinity ohms, stator or lighting
lead is open. Replace stator.