KTM 400-660 LC4 1998-2005, Repair Manual

Page: 148 / 501

7-37E
Checking the diodes
NOTE: Diodes conduct current only in the direction indicated by the
arrow, preventing the conduction of current in the opposite direction.
Two different kinds of diode defects can be distinguished:
– The diode conducts no current at all.
– The diode conducts current in both directions.
Diode defects can lead to different kinds of trouble, depending on the
type of defect.
NOTE: Both diodes are the same type and require the same testing
procedure. They are each located in a 2-pole connector and can be
identified by the color of the cables leading up to and away from the
respective connector.
Checking the diodes for faultless operation:
– Remove the headlight mask.
– Pull the diode to be tested out of the connector.
– Connect an appropriate ohmmeter to the diode and check for
continuity.
– Connect the ohmmeter in the opposite direction and check if the
diode prevents current conduction in the opposite direction.
Checking the clutch switch
– Disconnect the clutch switch from the cable tree.
– Connect the ohmmeter to the 2-pole connector
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(cable colors:
yellow/yellow) of the clutch switch and slowly pull the clutch lever.
– The switch must connect when the lever is pulled approximately half
of the overall distance.
Checking the tip switch and the emergency off switch
– Remove the headlight mask.
– Disconnect the 4-pole connector
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of the tip switch/emergency OFF
switch from the cable tree.
– Use an ohmmeter and test both switches according to the table
below (please refer to the sketch for the configuration of the
connector).
– Then check all lines for ground contact.
starter
tip
switch
emergenc
y off
switch
Circuit Position Condition
Emergency off switch duct
Emergency off switch no duct
Tip switch operated duct
Tip switch not operated no duct
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