Stihl 064 Service Manual page 65

STIHL 064, 066
9.1.1 Troubleshooting Chart
yes
Do both handles warm up?
Heater switch on "I"
Measure resistance of
individual components
Check rear handle heating element.
Resistance between generator
connection (1) and engine ground
Check ground wire between tank
housing and crankcase.
Resistance between switch housing
and crankcase approx. 0 ?
Disconnect plug connection at
Switch has to be partly removed
Check front handle heating element.
Resistance approx. 1.6
Check heater switch
Start
no
yes
with ohmmeter
In good condition?
Bonding ok?
yes
Resistance
approx. 0.25 ?
yes
Check generator.
0.6 ?
yes
yes
heater switch.
for this purpose.
?
yes
Closed: approx. 0 ?
Open: high reading?
yes
System in order.
no
Turn
on switch
no
Replace
rear handle
no
heating element
no
Replace
generator
no Fit new ground
wire between
heater switch
and crankcase
no
Replace
front handle
no
Fit new
Switch
65