Test Connections And Test Values - Stihl MS 460 Service Manual

14.1.2 Test Connections and Test Values

– The pin and socket connections
of the wires in the rear handle
must be disconnected to test the
individual components
separately.
Component
Switch
Heating element in
rear handle
Heating element in
front handle
Generator W
1)
Disconnect the wire
MS 460, MS 460 C
Ohmmeter connection
(use either test lead)
Lead 1 Lead 2
Switch Ground
1)
terminal
Terminal Terminal
socket on pin on wire
wire from from rear
rear handle
heating
handle
heating element
element
Connector Ground
on wire
from front
handle
heating
element
Connector Ground
on wire
Resistance W If faulty
Spec. Actual Cause
< 0.5 - Switch faulty
1.0 0.8...1.2 Heating element
OK
- Break in wire,
heating element
damaged
0 Short circuit –
damaged insulation
7.0 6.0...8.0 Heating element
OK
- Break in wire,
heating element
damaged
0 Short circuit –
damaged insulation
0.8 0.6...1.0 Generator OK
Remedy
Replace switch
Install new heating
element or repair
insulation
Install new front
handle
Repair
insulation
85