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Diode Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 Mercury Sable, 1990 Mercury Grand Marquis, 1990 Lincoln Mark VII, 1990 Lincoln Continental, and 1990 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove rectifier assembly from alternator. Set ohmmeter on "x1" scale. To test one set of diodes, contact one ohmmeter probe to terminal screw and contact each of 3 stator lead terminals with other probe.
  2. Reverse probes and repeat test. All diodes should show readings of approximately 6 ohms in one direction and infinite readings with probes reversed.
  3. Repeat test for other set of diodes, moving first probe to other terminal screw. If meter readings are not as specified, replace rectifier assembly.
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