Impreza Coupe FWD F4-1820cc 1.8L SOHC (1995)
Alternator: Testing and Inspection
Inspection and Repair
Generator
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.
3. Checking trio diode
Check the trio diode using a circuit tester. It is in good condition if continuity exists only in one direction.
2. ROTOR
1. Slip ring surface
Inspect slip rings for contamination or any roughness of the sliding surface. Repair slip ring surface using a lathe or sand paper.
2. Slip ring outer diameter