Testing (Off Car)

With alternator disassembled, perform rotor and stator open, shorts and continuity tests. See General Servicing in this section  . Disconnect stator leads from rectifier board. Using ohmmeter set to XI scale, touch one lead to a diode junction and the other to heat sink and note reading. Reverse leads and note reading, then repeat for other diodes. One high and one low reading should be obtained for each diode. Replace diode plate if proper readings are not obtained.