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Positive Heat Sink Test

  1. Connect diode tester positive lead to positive heat sink and touch negative lead to each of the 3 diode terminals. See Fig 1. A high resistance should be indicated. If any of the 3 diodes shows a low resistance, diode is shorted and entire heat sink must be replaced.
    Fig 1: Testing Positive Heat Sink
    G91B13434Courtesy of FORD MOTOR CO.
  2. Reverse test leads so that negative test lead is connected to positive heat sink. Touch negative lead to each of the 3 diode terminals. A low resistance should be indicated. If any of the 3 diodes shows a high resistance, diode is open and entire heat sink must be replaced.
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