Outback F4-2.5L (2008)
Alternator: Testing and Inspection
INSPECTION
1. DIODE
CAUTION: There is the possibility of damaging the diodes if a mega-tester (used to measure high voltages) or a similar measuring
instrument is used. Never use a mega tester or equivalent for this test.
1. Check the positive diode
Check for continuity between the diode lead and positive side heat sink. If resistance is 1 ohm or less only in the direction from the diode lead
to the heat sink, the positive diode is OK.
2. Check negative diode
Check for continuity between the negative side heat sink and diode lead. If resistance is 1 ohm or less only in the direction from the heat sink
to the diode lead, the negative diode is OK.
2. ROTOR
1. Slip ring surface
Inspect the slip rings for contamination or any roughness on the sliding surface. Repair the slip ring surface using a lathe or sand paper.
2. Slip ring outer diameter
Measure the slip ring outer diameter. Replace the rotor assembly if the slip ring is worn.
Slip ring outer diameter:
Standard 22.7 mm (0.894 in)
Limit 22.1 mm (0.870 in)
3. Continuity test
Using a circuit tester, check the resistance between slip rings.
If the resistance is not within the standard, replace the rotor assembly.
Specified resistance:
Approximately 1.6 - 1.9 ohms