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Tool C-3829A Method (Positive Rectifiers)

  1. Re move alternator brushes and through bolts. Separate rectifier end shield and stator from drive end shield, pulley and rotor. With alternator on an insulated surface, connect test lead clip to alternator "BAT" output terminal. Plug tool into 110 volt A.C. power supply. Touch test probe to metal strap for each positive rectifier. Reading for satisfactory rectifiers will be 1 3/4 amperes or more and should be approximately the same for each rectifier. Meter needle should also move in same direction for each rectifier.
  2. When 2 rectifiers are good and 1 is shorted,/reading taken at good rectifiers will be low and reading at shorted rectifier will be zero. Disconnect lead to rectifier reading zero and retest. Reading of good rectifiers will now be within satisfactory range. When 1 rectifier is open, it will read approximately 1 ampere, and 2 good rectifiers will read within satisfactory range.
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