Forester L F4-2.5L SOHC (1999)
Alternator: Testing and Inspection
Inspection and Repair
1. DIODE
CAUTION: 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 continuity exists only in
the direction from the diode lead to the heat sink.
2. Checking negative diode
Check for continuity between the negative side heat sink and diode lead. The negative diode is in good condition if continuity exists only in the
direction from the heat sink to the diode lead.
2. ROTOR
1. Slip ring surface
Inspect slip rings for contamination or any rough- ness of the sliding surface. Repair slip ring surface using a lathe or sand paper.
2. Slip ring outer diameter
Measure slip ring outer diameter. If slip ring is worn replace rotor assembly.
Slip ring outer diameter:
Standard: 22.7 mm (0.894 in)
Limit: 22.1 mm (0.870 in)
3. Continuity test
Check resistance between slip rings using circuit tester. If the resistance is not within specification, replace rotor assembly.
