Positive Rectifier

Connect one ohmmeter lead to positive heat sink. Connect other ohmmeter lead to positive rectifier pin and test for continuity. See Fig 1.

Fig 1: Front View of Rectifier Showing Rectifier Testing Points Rectifier connections should have continuity in one direction only.
Reverse ohmmeter leads and retest. There should be continuity in only one direction. If there is continuity in both directions, rectifier is short-circuited. If there is no continuity in either direction, rectifier is open. If rectifier is shorted or open, replace rectifier assembly.