Stihl MS 650

102 MS 650, MS 660
Component Ohmmeter connection
(use either test lead)
Resistance Ω If faulty
Lead 1 Lead 2 Spec. Actual Cause Remedy
Generator Connector
on yellow
wire
Ground 0.5 0.3...1.0 Generator OK
- Break in wire,
generator damaged
Install new
generator
0 Short circuit –
damaged insulation
Repair
insulation
Generator Connector
on yellow
wire
Connector
on red
wire
1.0 0.8...1.8 Generator OK
- Break in wire,
generator damaged
Install new
generator
0 Short circuit –
damaged insulation
Install new
generator