Rectifier Diodes

With rectifier assembly on bench, contact diode plate with one probe and each of the 3 diode leads with other probe. Note ohmmeter reading. Reverse probes and repeat test. Check all diodes in this manner.
All diodes should show a low reading in one direction and NO reading in opposite direction. If any rectifier diode is defective, replace rectifier assembly.
On all models, set ohmmeter to x100 ohm scale. Check for continuity between terminals "B" and "F". There should be continuity in one direction only.

Fig 1: Exploded View of Spectrum & Sprint Alternators Toyota alternators are similar.