Section 12 (Starting/Charging Systems (H4SO)): Generator: Inspection: Diode
WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
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.
- Check the positive diode
Check for continuity between the diode lead and positive side heat sink. If resistance is 1 Ω or less only in the direction from the diode lead to the heat sink, the positive diode is OK.
- Check negative diode
Check for continuity between the negative side heat sink and diode lead. If resistance is 1 Ω or less only in the direction from the heat sink to the diode lead, the negative diode is OK.