Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Ford >> 1991 >> Bronco 4.9 Y, Standard, M5OD-R2 >> Repair and Diagnosis >> Electrical >> Charging Systems >> LEECE-NEVILLE 165-Amp Alternator >> Bench Testing >> Negative Heat Sink Test

Negative Heat Sink Test

  1. Connect diode tester negative lead to negative heat sink and touch positive 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 Negative Heat Sink
    G91C13435Courtesy of FORD MOTOR CO.
  2. Reverse test leads so that positive test lead is connected to negative 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.
scientia non olet · About Mike's Workshop Manuals