Section 139 (Starting System & Charging System (H4SO)): Generator: Inspection: Diode
WARNING: This page is about a different car, the 2005 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Never use a mega tester (measuring use for high voltage) or any other similar measure for this test; otherwise, the diodes may be damaged.
- Checking positive diode
Check for continuity between the diode lead and positive side heat sink. The positive diode is in good condition if resistance is 1 ohm or less only in the direction from the diode lead to heat sink.
- Checking negative diode
Check for continuity between the negative side heat sink and diode lead. The negative diode is in good condition if resistance is 1 ohm or less only in the direction from the heat sink to diode lead.