Summary Of Test Connections And Test Values - Stihl MS 441 Manual

15.7.2 Summary of test connections and test values

– The wires in the rear handle
must be unplugged to test the
individual components
separately.
Component Ohmmeter connection
(either test lead can be
used)
Lead 1
Switch Switch
connection
Socket terminal Socket
terminal
Heating element Connector
in rear handle to lead
from
heating
element
Heating element in Connector
front handle to lead
from front
handle
heating
element
1)
Pull wire out for this purpose
MS 441, MS 441 C
Resistance in ohm
Lead 2 Required Actual
Switch < 0.5
1)
housing
Ground 0
Connector 1.6
to lead
from
heating
element
Connector 6.4
to lead
from front
handle
heating
element
If faulty
Cause
– Switch faulty
> 1.0 Poor ground
connection
1.5 – 2.0 Heating element OK
– Break in wire, heating
element damaged
0 Short circuit due to
damaged insulation
6.0...8.0 Heating element OK
– Break in wire, heating
element damaged
0 Short circuit due to
damaged insulation
Remedy
Replace switch
Replace ground
wire
Replace heating
element and repair
insulation
Replace front
handle
Repair insulation
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