Subaru XT 1988 Service Manual page 1202

ENGINE ELECTRICAL SYSTEM 6-1
5) Unsolder the rectifier and remove the stator.
Rectifier
L6-1658
Fig. 46
6) Remove the brushes by unsoldering at the pigtails.
L6-1659
Fig.
47
INSPECTION AND REPAIR
DIODE
Never use a megger tester (measuring use for high voltage) or
any other similar measure for this test; otherwise, the diodes
may be damaged.
1) Checking positive diode
Check for continuity between the diode lead and the positive
side heat sink. The positive diode is in good condition if con-
tinuity exists only in the direction from the diode lead to the
Fig.
48
2) Checking negative diode
Check for continuity between the negative side heat sink and
diode lead. The negative diode is in good condition if con-
tinuity exists only in the direction from the heat sink to the
diode lead.
Fig.
49
Heat sink (Negative side)
fF==~
3) Checking trio diode
Check the trio diode using a circu it tester. It is in good con-
dition if continuity exists only in one direction.
heat sink. Fig. 50
21