Mazda 323 1988 Workshop Manual page 379

5
ALTERNATOR
2. Negative diode
Check for continuity between the diode lead and
the heat sink at the negative side. There should be
continuity only in the direction from the heat sink
to the diode.
3. Trio diode
Check for continuity by using a circuit tester.
There should be continuity in one direction only.
5-20
'_A