Testing Wiring Harness - Stihl MS 460 Service Manual

: Pull the grommet and wires
(arrow) out of the tank housing.
2
1
: On machines with carburetor
heating, push back the insulating
tubes and unplug the connectors
(1 + 2).
– Remove the interlock lever,
b 10.2
– Pull the insulating tube off the
connector of the wire between
the generator and handle heating
element.
MS 460, MS 460 C
: Separate pin and socket
connections of both wires and
pull off the insulating tube.
– Pull the wire out of the grommet.
3
: Pull the short circuit wire (1) and
ground wire (2) off the contact
springs.
: On machines with heated
handles, remove the heater
switch (3), b 14.2
– Remove the wiring harness.
Install in the reverse sequence.
– After fitting the wiring harness,
press the wires into their
retainers.
– Fit the grommets properly in the
openings in the tank housing.
7.5.1

Testing Wiring Harness

If the spark plug and ignition lead
with spark plug boot are in order,
check the resistance of the short
circuit wire, ground wire and contact
spring.
: Pull the short circuit wire (arrow)
off the tag on the ignition module.
– Connect the ohmmeter to ground
1
and the short circuit wire.
2
– Set Master Control lever to " $ "
The resistance measured must be
about 0 Ohm. If it is much higher,
the reason is a break in the wire.
The wire or contact spring has to be
replaced.
– Set Master Control lever to " # "
The resistance measured must be
infinitely high. If not, fit a new short
circuit wire.
If no fault can be found, carry out
further checks:
– Examine flywheel for damage,
b 7.3
– Check air gap between flywheel
and ignition module,
b 7.3.2
It neither of these checks reveals a
fault, install a new ignition module,
b 7.1.2
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