Inspection - Mitsubishi S4Q User Manual

ELECTRICAL SYSTEM
Shape distortion, damage
Not provided in 24V-35A
(A3TN5776)
Figure 193 Inspection locations on alternator
Trio diodes
(+) heat sink
Figure 194 Inspecting diodes
Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
Open circuit, short circuit, wear
Cracks, damage
Open circuit, short circuit
(–) heat sink
Diode lead

28.4 Inspection

Worn brush
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.
ENGLISH
ALTERNATOR
Cracks, damage
Open circuit, short
circuit
129 / 174