Yanmar 3TNV Series Service Manual page 187

(4) Magnetic switch continuity test
Test type
Shunt coil Between C and ground
Series coil C and M
Replace if needed.
Resistance (at 20 )
Shunt coil
Series coil
Measurement point
S13-138
0.6
0.218
172
Normal Abnormal (cause)
Yes None (open circuit)
None Yes (short-circuiting)
9. Starting Motor