Mitsubishi S4Q User Manual page 130

ALTERNATOR
Figure 195 Field coil continuity
Figure 196 Field coil grounding test
Figure 197 Stator core continuity test
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2. Inspecting field coil
1) Check the continuity between the slip rings.
If there is no electric conduction, there is an
open circuit: replace the field coil.
2) Check the continuity between the slip ring and
shaft (or core).
If there is electric conduction, the field coil is
grounded: replace the field coil.
3. Inspecting stator core
1) Check the continuity between the stator core
and each lead wire.
If there is no electric conduction, there is an
open circuit: replace the stator core.
ENGLISH Service Manual Mitsubishi SQ-Series diesel engines
ELECTRICAL SYSTEM
Version 08/2004