Yanmar 4TNV98 Service Manual page 232

Magnetic Switch
If the starter motor becomes wet, replace the
magnetic switch even if the magnetic switch
assembly function is normal.
Shunt Coil Continuity Test
Check for continuity between the "S" terminal and
the switch body using a multimeter (Figure11-21).
The multimeter should indicate continuity.
If the multimeter does not indicate continuity,
replace the magnetic switch.
Figure 11-21
4TNV98 & 4TNE98 Diesel Engine
Series Coil Continuity Test
Check for continuity between the "S" and "M"
terminals using a multimeter (Figure11-22). The
multimeter should indicate continuity.
If the multimeter does not indicate continuity,
replace the magnetic switch.
Coil Resistance Test
See Starter Motor Specifications on page 222 for
the service limit.
230
Figure 11-22
Section 7. Starter Motor