Diode Assemblies

Use a test lamp not exceeding 24 volts, or an ohmmeter. Always disconnect the diodes from the stator windings before individual testing commences. Due to the three-phase bridge connection of rectifier, a faulty diode could not otherwise be detected. Connect test lamp in series to diode to be tested. The diode is efficient if lamp lights in only one of the two connection arrangements (reversing test leads). Diode is open if lamp does not light in either direction. Diode is shorted if lamp lights in both connection arrangements (see illustration).