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Rectifier Bridge Test

  1. Connect an ohmmeter with one lead touching the grounded heat sink and the other lead touching flat metal on one of the 3 terminals. Observe reading and reverse test lead connections. See Fig 1.
  2. If both readings are the same, replace rectifier bridge. A good bridge will give 1 high and 1 low reading. Repeat test on all terminals (6 tests using grounded heat sink).
  3. Now, connect test leads to insulated heat sink and 1 edge of the 3 terminals. Observe reading and reverse connections. Repeat test on all terminals (6 tests with insulated heat sink).
  4. When all 12 tests have been made, testing is complete. Do not use high voltage, such as 100-volt test lamp to check bridge. Do not replace diode trio or rectifier bridge unless at least 1 pair of readings is the same (with leads reversed).
Fig 1: Bench Testing Rectifier Bridge and Identification of End Frame Components
G09316937Courtesy of GENERAL MOTORS COMPANY
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