Rectifier Test

NOTE: The diodes are designed to allow current to pass in one direction while blocking it in the opposite direction. Since the alternator rectifier is made up of nine diodes, each diode must be tested for continuity in both directions with an ohmmeter that has diode checking capability; a total of 18 checks.

Check for continuity in each direction between
- the B and P terminals.
- the B' and P terminals.
- E (ground) and the P terminals.
  All diodes should have continuity in only one direction.
  
  Fig 1: Identifying Rectifier
  Courtesy of AMERICAN HONDA MOTOR CO., INC.
If any of the diodes fails, replace the rectifier assembly. (Diodes are not available separately.)