Rectifier Test

Nippondenso Type:

NOTE:
•   The diodes are designed to allow current to pass in one direction while blocking the opposite direction. Each diode must be tested for continuity in both directions. Since the rectifier is made up of eight diodes, there are a total of 16 checks.
•   Use an ohmmeter capable of checking diodes.

1. Check for continuity in each direction between the B and P terminals, and between the E (ground) and P terminals of each diode pair.
All diodes should have continuity in only one direction.

2. If any of the eight diodes fails, replace the rectifier assembly (diodes are not available separately).
Mitsubishi Type:

NOTE:
•   The diodes are designed to allow current to pass in one direction while blocking the opposite direction. Each diode must be tested for continuity in both directions. Since the rectifier is made up of eleven diodes, there are a total of 22 checks.
•   Use an ohmmeter capable of checking diodes.

1. Check for continuity in each direction between the B and P terminals, E (ground) and P terminals, and between the B' and P (except P4) terminals of each diode pair. All diodes should have continuity in only one direction.

2. If any of the eleven diodes fails, replace the rectifier assembly (diodes are not available separately).