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Rectifier Bridge Test

  1. Connect an ohmmeter with one lead touching grounded heat sink and the other lead touching flat metal on 1 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 one high and one low reading. Repeat test on all terminals (6 tests with insulated heat sink).
  3. 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 110-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 ID of End Frame Components Observe reading and reverse test lead connections.
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Fig 2: Exploded View of Delcotron Alternator Model 10SI Alternator is used on Chevrolet, GMC and Jeep.
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