Rectifier Assembly Test

Remove the rectifier assembly from the alternator. Place the ohmmeter, Rotunda or equivalent, Multiply-By setting at 1 and calibrate the meter.

NOTE: Text values shown in brackets [ ]___ are referenced to Rotunda Model 059-00010 and may be different if another tester is used.

CAUTION: Digital meters cannot be used to perform these tests.





1. Positive Diode (non-grounded): Check for continuity between the positive diode lead and the heat sink at the positive side, using an ohmmeter, Rotunda Model or equivalent. There should be continuity ONLY in the direction from the diode lead to the heat sink.





2. Negative Diode (grounded): Check for continuity between the negative diode lead and the heat sink at the negative side, using an ohmmeter. There should be continuity ONLY in the direction from the heat sink to the negative diode.









3. Diode Trio: Check for continuity using an ohmmeter. There should be continuity in one direction ONLY.
4. If the meter readings are not as specified, replace the rectifier assembly.