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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ALTERNATOR
ENGLISH
ELECTRICAL SYSTEM
28.4 Inspection
28.4.1 Key points in inspection
1. Inspecting diodes
For inspection of individual diodes, check the
resistance between each diode lead and heat sink.
Take resistance measurements by connecting the
positive (+) wire of a tester to the diode and also by
connecting the negative (-) wire to the diode. If the
resistance shows “infinite” in both measurements,
there is an open circuit. If the resistance is close to
0 in both measurements, there is a short circuit.
If there is an open or short circuit, the diode is
faulty and the rectifier must be replaced.
Figure 193 Inspection locations on alternator
Open circuit, short circuit, wear
Cracks, damage
Shape distortion, damage
Open circuit, short
circuit
Worn brush
Open circuit, short circuit
Cracks, damage
Not provided in 24V-35A
(A3TN5776)
Figure 194 Inspecting diodes
(+) heat sink
Diode lead
(–) heat sink
Trio diodes
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