Kohler Command CV740 Service Manual

Electrical System
48 24 690 07 Rev. HKohlerEngines.com
3 Amp/70 Watt Lighting Stator
NOTE: Zero ohmmeteres on each scale to ensure
accurate readings. Voltage tests should be made
with engine running at 3000 RPM with no load.
Battery must be good and fully charged.
To test charging system for no charge to battery:
1. With engine running in fast setting, measure voltage
across battery terminals using a DC voltmeter.
Condition Conclusion
Voltage is more than 12.5
volts.
Charging system is OK
Voltage is 12.5 volts or
less.
Stator or diode are
probably faulty. Continue
testing stator and diode.
2. Remove connector from rectier-regulator. With
engine running in fast position, measure AC voltage
across stator leads using an AC voltmeter.
Condition Conclusion
Voltage is 28 volts or
more.
Stator winding is OK.
Voltage is less than 28
volts.
Test stator using an
ohmmeter.
3. With charging lead disconnected from battery and
engine stopped, measure resistance from charging
lead to ground using an ohmmeter. Note reading.
Reverse leads and measure resistance again.
In one direction, resistance should be innity ohms
(open circuit). With leads reversed, some resistance
should be measured (about midscale on Rx1 range).
Condition Conclusion
Resistance is low in both
directions.
Diode is shorted. Replace
diode.
Resistance is high in both
directions.
Diode or stator winding is
open. Continue testing.
4. Cut sleeving on charging lead to expose diode
connections.
Measure resistance from stator side of diode to
ground using an ohmmeter.
Condition Conclusion
Resistance is
approximately 1.07 ohms.
Stator winding is OK,
diode is open. Replace
diode.
Resistance is 0 ohms. Stator winding is shorted.
Replace stator.
Resistance is innity
ohms.
Stator winding or lead is
open. Replace stator.
To test charging system for no lights:
1. Make sure lights are not burned out.
Condition Conclusion
Burned out lights. Replace.
2. Disconnect lighting lead from wiring harness.
With engine running in fast setting, measure voltage
from lighting lead to ground using an AC voltmeter.
Condition Conclusion
Voltage is 15 volts or
more.
Stator is OK. Check for
loose connections or
shorts in wiring harness.
Voltage is less than 15
volts.
Test stator using an
ohmmeter.
3. With engine stopped, measure resistance of stator
from lighting lead to ground using an ohmmeter.
Condition Conclusion
Resistance is
approximately 0.4 ohms.
Stator is OK.
Resistance is 0 ohms. Stator is shorted. Replace
stator.
Resistance is innity
ohms.
Stator or lighting lead is
open. Replace stator.

Kohler Command CV740 Specifications

General

Brand	Kohler
Model	Command CV740
Category	Engine
Language	English