DESCRIPTION
Mitsubishi alternators are conventional 3-phase, self-rectifying type units containing 6 diodes (3 positive and 3 negative) which are used to rectify current. A case-mounted Integrated Circuit (IC) regulator is used on all models.
ON-VEHICLE TESTING
Note. On-vehicle testing for Hyundai is not available from manufacturer.
DIODE ASSMBLY
- Check each diode with ohmmeter in both directions. If diodes show large resistance in one direction and small resistance in other direction, diodes are normal.
- If diodes show small resistance in both directions, it is shorted. If large resistance is shown in both directions, diode is open. If any diodes are defective, replace rectifier assembly.
ROTOR
Check continuity across rotor slip rings. A reading of 2.6-3.2 ohms on Hyundai Excel must be obtained. If there is no continuity, replace rotor. Check continuity between individual slip rings and rotor core/shaft. If there is continuity, rotor coil or slip ring is grounded. Replace rotor.
STATOR
Ensure no continuity exists between stator coil leads and stator core. Check continuity between leads of stator coil. If there is no continuity, replace stator.
BRUSHES
- Replace brushes if worn to limit line. Standard brush spring tension should be 12-16 oz. (340-453 g). Replace if less than 7 oz. (198 g) or if springs are corroded.
- To remove brushes from holder, unsolder pigtail from terminal. To replace, solder pigtail to terminal ensuring 1/4" of brush will be located in brush holder.
